JP5037546B2 - Network storage control device, network storage system, and network storage control method - Google Patents

Description

  The present invention relates to a network storage control device, a network storage system, and a network storage control method.

  Currently, from the viewpoint of security such as effective utilization of resources (for example, a CPU (Central Processing Unit), memory, graphic card) of a client terminal (for example, a personal computer) or prevention of information leakage, a thin client system based on network boot is used. It's being used. Here, the thin client system by network boot refers to information used in the client terminal (for example, an OS (Operating System) operating on the client terminal, an application program, information created in the client terminal) in the network storage device. A system that is stored in advance in units of volume, and that is activated and processed by causing the client terminal to read the information from the network storage device via the network.

  That is, in the case of a thin client system by network boot, information used in each client terminal is stored in the network storage device. Therefore, the thin client system by network boot effectively uses its own resources or information It is said to be effective in preventing leakage.

  In addition, techniques related to the maintenance (for example, version upgrade, application of security patches) of OSs and programs (OSs and programs read by a client terminal) held by a network storage device have been proposed (for example, Patent Documents 1 and 2). reference).

  For example, in Patent Document 1, a maintenance volume (master unit storage unit) and a user volume (replica unit storage unit) are provided, and after maintenance is completed, the maintenance volume is copied as a new operation volume. In other words, a technique for switching from a maintenance volume to an operation volume is disclosed. According to this technique, if maintenance is performed only on the maintenance volume, the maintenance content for the maintenance volume is reflected in the user volume, so the maintenance cost is reduced.

  Patent Document 2 is an improved technique of the technique of Patent Document 1, but discloses a technique for improving the disk use efficiency of storage. Specifically, in the case of the technique disclosed in Patent Literature 1, it is necessary to copy the user volume for the number of client terminals. In the case of the technology of Patent Literature 2, the disk is shared by sharing the user volume. We are trying to improve the usage efficiency.

International Publication No. 2006/095875 Pamphlet JP 2006-252112 A

  However, the conventional technology (for example, the technology disclosed in Patent Technology 1 and Patent Document 2) is based on an embodiment in which maintenance of a maintenance volume is performed at a certain time interval. That is, the prior art does not assume an embodiment in which maintenance is continuously performed on a maintenance volume. Therefore, there is a problem that the contents of maintenance cannot be continuously reflected. In other words, since the contents of maintenance cannot be reflected immediately, there is a problem that maintenance may not be performed at an appropriate timing. Specifically, there is a problem that the content of the current maintenance cannot be reflected immediately after the content of the previous maintenance is reflected.

  For example, immediately after the previous maintenance is performed, when urgent maintenance including application of a security patch and update of a virus definition file is required, the content of the maintenance cannot be immediately reflected. In the case of this example, a problem remains in terms of security. Further, even if there is no problem in terms of security, there is a problem that it may not be possible to respond to a request for appropriately reflecting the contents of maintenance. In other words, immediately after the contents of the previous maintenance are reflected, there is a problem that it is not possible to respond to a request to reflect the contents of the current maintenance.

  In addition, in the prior art, the reason why the contents of maintenance cannot be continuously reflected is supplemented. At the end of the maintenance, as shown in FIG. 11A, if there is no user of the old operation volume, the old operation volume can be deleted. If the old operation volume can be deleted, the operation volume can be switched (reflected) to the old operation volume. If the operation volume can be switched to the old operation volume, the maintenance volume can be switched to the operation volume. As described above, if there is no user of the old operation volume at the end of the maintenance, the contents of the maintenance can be reflected in the whole. Note that when the operation volume is switched to the old operation volume, the user of the operation volume becomes the user of the old operation volume. The user of the old operating volume continues to use the old operating volume during startup, but becomes the user of the operating volume because the operating volume is used when restarted.

  At the end of the maintenance, as shown in FIG. 11B, if there is a user of the old operation volume, the old operation volume cannot be deleted. Therefore, it is impossible to switch the operation volume to the old operation volume, switch the maintenance volume to the operation volume, and switch the maintenance volume to the operation volume. As described above, when the user of the old operation volume exists at the end of the maintenance, the contents of the maintenance cannot be reflected on the whole. In addition, as described above, the user of the old operation volume appears by switching the operation volume to the old operation volume, and since it continues to be the user of the old operation volume during startup, the time from the latest reflection to the shutdown , Will exist. From the above, in the prior art, the contents of maintenance cannot be reflected continuously. In other words, in the prior art, the contents of maintenance cannot be reflected within the time interval in which the user of the old operation volume still exists.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a technique capable of performing maintenance and reflecting the contents even when there is a user of an old operation volume. And

  In order to solve the above problem, a network storage control apparatus according to an aspect of the present invention is a network storage apparatus that stores a plurality of volumes that are management units of information necessary for operation of a client terminal, and is a maintenance-related volume. The maintenance volume, the volume after the system switching of the maintenance volume and the operating volume that is the active volume, and the old volume that is the volume after the system switching of the operating volume and is the old operating volume are stored A network storage control device that controls the network storage device to be used, the system management information indicating the current system of each volume, the usage status information indicating the volume usage status by the client terminal, and an old number that is two or more Operational volume The storage unit that stores the maximum number of generations as maximum generation number information and the system management information, usage status information, and maximum generation number information in the storage unit when switching the system, the maximum number of old operational volumes in use is generated When the number is less than the number, the storage device control unit transmits a system switching command, which is a command related to system switching, to the network storage device.

  The maximum number of generations may be the maximum number of old operational volumes that can be stored in the network storage device.

  In the network storage control device, the storage device control unit refers to the system management information and the usage state information in the storage unit, and issues a delete command that is a command related to deletion of the old operation volume that is not used by the client terminal to the network storage device. You may make it transmit to.

  In the network storage control device, the storage device control unit may not transmit the system switching command to the network storage device when the maintenance volume is used by the client terminal.

  In order to solve the above problem, a network storage system according to another aspect of the present invention includes a network storage device that stores a plurality of volumes, which are management units of information necessary for the operation of a client terminal, and a network that controls the network storage device A network storage system comprising a storage control device, the network storage device comprising a maintenance volume that is a maintenance volume, an operation volume that is an operation volume that is a volume after the system switching of the maintenance volume, and an operation volume A storage unit for storing the old operational volume that is the volume after the system switching of the volume and is the old operational volume, and the network storage control device Information, a usage status information indicating the usage status of a volume by the client terminal, and a storage unit for storing the maximum generation number information indicating the maximum generation number of the old operation volume which is a number of 2 or more, and a memory for switching the system Refers to the system management information, usage status information, and maximum generated number information in the department, and if the number of old operational volumes in use is less than the maximum generated number, sends a system switching command, which is a command related to system switching, to the network storage device And a storage device control unit.

  In order to solve the above problem, a network storage control method according to another aspect of the present invention is a network storage device that stores a plurality of volumes, which are management units of information necessary for the operation of a client terminal, and is a maintenance system. The maintenance volume that is the volume, the operation volume that is the active volume after the system switchover of the maintenance volume, and the old operation volume that is the volume after the system switchover of the operation volume and is the old active volume A network storage control method for controlling a network storage device to be stored, which is system management information indicating a current system of each volume, usage status information indicating a volume usage status by a client terminal, and a number of 2 or more Old operation volume In the step of storing the maximum generation number information indicating the maximum generation number and the system switching, the system management information, the usage status information and the maximum generation number information in the storage unit are referred to, and the number of old operational volumes in use is maximum. A step of transmitting a system switching command, which is a command related to system switching, to the network storage device when the number is less than the number of generations.

  According to the present invention, even if there is a user of the old operation volume, the maintenance can be performed and the contents can be reflected.

1 is a configuration diagram of a network storage system 1 according to a first embodiment. FIG. Examples include system management information, usage status information, and maintenance terminal identification information. It is a conceptual diagram of system switching processing. 4 is a flowchart illustrating an example of a system switching process of the network storage control device 20. 3 is a sequence diagram illustrating an example of a system switching process of the network storage system 1. FIG. 12 is a flowchart illustrating another example of the system switching process of the network storage control device 20. FIG. 10 is a sequence diagram illustrating another example of the system switching process of the network storage system 1. It is a block diagram of the network storage system 2 which concerns on 2nd Embodiment. It is a block diagram of the network storage system 3 which concerns on 3rd Embodiment. It is an example of maintenance application information and old operation volume usage record information. It is a figure for demonstrating a prior art.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. The net storage system 1 according to the first embodiment of the present invention includes a network storage device 10 and a network storage control device 20 as shown in FIG. The network storage device 10 communicates with the network storage control device 20 and also communicates with a plurality of client terminals 40 (client terminal 40-1, client terminal 40-2,...). The network storage control device 20 communicates with the network storage device 10 and also communicates with the system management terminal 30 and the plurality of client terminals 40. The communication may be performed by, for example, iSCSI (Internet Small Computer System Interface). Further, each of the devices and terminals shown in FIG. 1 is not limited to the number shown in FIG. 1, and any number may be used depending on the system application scene, network environment, and the like.

  The network storage device 10 includes a storage unit 100 and a volume control unit 110. The storage unit 100 stores a plurality of volumes having different systems. The volume is a management unit of information necessary for the operation of each client terminal 40 belonging to the network storage device 10. Information necessary for the operation of the client terminal 40 is, for example, an OS program or an application program executed on the client terminal 40. Further, the volume is transmitted to the client terminal 40 in response to a volume read request from the client terminal 40 and used in the client terminal 40. The system indicates another usage mode of the volume by the client terminal 40.

  More specifically, the storage unit 100 stores one maintenance volume 110, one operation volume 120, and one or more old operation volumes 130. The number of old operation volumes 130 stored in the storage unit 100 (hereinafter referred to as “actual generation number M”, where M is an integer of 1 or more) is the maximum generation number N (N is 2 or more) managed by the network storage control device 20. Integer) or less. For example, when the maximum generation number N is 10, the storage unit 100 stores 1 to 10 old operational volumes 130. That is, when N = 10, M = 1, 2, 3,... The maximum generation number N is a fixed number (static number) in the net storage system 1.

  The maintenance volume 110 is a maintenance system (system) volume. The maintenance volume 110 is a volume that is transmitted to and read from the client terminal 40 in response to a maintenance volume read request that is transmitted from the client terminal 40 that belongs to the network storage apparatus 10. The maintenance volume 110 is maintained by the client terminal 40 that has been transmitted and read. The term “maintenance” refers to version upgrade of programs in the maintenance volume, application of security patches, and the like.

  The operation volume 120 is a volume after system switching of the maintenance volume 110 and is an operation system (system) volume. The operation volume 122 is a volume that is transmitted to and read from the client terminal 40 in response to an operation volume read request transmitted from the client terminal 40 belonging to the network storage apparatus 10.

  The old operation volume 130 is a volume after system switching of the operation volume 120 and is an old operation system (system) volume. In other words, the old operation volume 130 is a volume that has been handled as the operation volume 120 until the maintenance volume 120 maintained by the client terminal 40 is moved to the operation stage and is handled as the operation volume 122.

  The volume control unit 110 receives a volume read request transmitted from the client terminal 40. When the volume control unit 110 receives a volume read request from the client terminal 40, the volume control unit 110 reads the volume corresponding to the volume read request from the storage unit 100 and transmits the volume to the client terminal 40. Specifically, the volume control unit 110 establishes a session with the client terminal 40 in response to the volume read request, and transmits / receives information such as a program included in the volume to / from the client terminal 40, for example.

  In addition, the volume control unit 110 receives a system switching command that is a command related to system switching from the storage device control unit 230 of the network storage control device 20. More specifically, the volume control unit 110 receives a replication command relating to the replication of the maintenance system volume as a system switching command. Receiving the system switching command, the volume control unit 110 executes system switching processing according to the system switching command. More specifically, the volume control unit 110 replicates the maintenance volume according to the replication command. Further, when the volume control unit 110 receives a delete command, which is a command related to deletion of the old operation volume, from the storage device control unit 230 of the network storage control device 20, the volume control unit 110 deletes the old operation volume according to the delete command. Note that the volume control unit 110 may receive the deletion command as a system switching command, or may receive the deletion command as a command separate from the system switching command. The delete command includes the volume name of the old operational volume to be deleted (details will be described later).

  The network storage control device 20 includes a storage unit 200, a web service unit 210, an activation service unit 220, and a storage device control unit 230.

  The storage unit 200 stores various information for managing the network storage device 10. Specifically, the storage unit 200 stores system management information, usage state information, maintenance terminal identification information, startup basic information, and maximum generated number information.

  The system management information is information indicating the current system of each volume. As shown in FIG. 2A, the storage unit 200 stores an OS area group name and a system name in association with a volume name as system management information. The volume name is information for identifying each volume stored in the storage unit 100 of the network storage device 10. Hereinafter, the volume identified by the volume name “X” is referred to as volume “X”. The OS area group name is information for specifying the contents of each volume such as an OS program and an application. The system name is information indicating the current system (for example, any one of the maintenance system, the operation system, and the old operation system) of each volume. According to the example (first line) shown in FIG. 2A, the storage unit 200 stores information that the volume “M” contains “OS1” and is currently a maintenance volume.

  The usage status information is information indicating the current usage status of each volume by the client terminal 40. As shown in FIG. 2B, the storage unit 200 stores a volume name in association with a client name as usage state information. The client name is information for identifying each client terminal 40. The volume name is information for identifying each volume stored in the storage unit 100 of the network storage device 10 as described above. Hereinafter, the Klein terminal 40 identified by the client name “X” is referred to as a client terminal “X”. According to the example (first line) shown in FIG. 2B, the storage unit 200 stores information that the client terminal “C5” is using the volume “M”. Therefore, according to the system management information (first line) and the usage state information (first line), the storage unit 200 stores that the client terminal “C5” is using the maintenance volume “M”. Yes.

  The maintenance terminal specifying information is information for specifying a maintenance terminal that is the client terminal 40 that performs maintenance. As shown in FIG. 2C, the storage unit 200 stores a maintenance flag in association with the client name as the maintenance terminal specifying information. The client name is information for identifying each client terminal 40 as described above. The maintenance flag is a flag indicating whether each client terminal 40 is a maintenance terminal. Therefore, according to the maintenance terminal specifying information, it can be determined whether or not a certain client terminal 40 is a maintenance terminal. The maintenance flag is set by, for example, an instruction from the system management terminal 30. The client terminal 40 serving as the maintenance terminal is specified in the system management terminal 30, and the maintenance terminal specifying information is stored in the network storage control device 20. Is remembered.

  The startup basic information is information that is the basis of the startup information that is transmitted to the client terminal in response to a startup information request from the client terminal 40. The activation information is, for example, a boot file and the like, a destination volume name that is a volume name for designating a volume to be read in a volume read request, and a system of volumes related to the destination volume name (for example, maintenance system, operation system This is information including a destination volume system name which is information indicating any one of them. The storage unit 200 stores startup basic information for each client terminal 40.

  The maximum generated number information is information indicating the maximum generated number N (N is an integer of 2 or more) of the old operation volume. As described above, the number of old operational volumes 130 stored in the storage unit 100 (that is, the actual number M) is equal to or less than the maximum number N. For example, when the maximum generation number N is 10, the actual generation number M is any one of 1, 2, 3,. Further, as described above, the maximum generation number N is a fixed number, but the maximum generation number N, which is a fixed number, may be the maximum number of old operational volumes 130 that can be stored in the network storage device 10. Further, the maximum generation number N is set or reset by a command from the system management terminal 30, for example. That is, the maximum generation number N is designated in the system management terminal 30 and stored in the network storage control device 20 as maximum generation number information.

  The web service unit 210 provides a web service function to the system management terminal 30. The web service unit 210 communicates with the system management terminal 30 using a web service function. The web service unit 210, for example, transmits various information in the storage unit 200 to the system management terminal 30 in accordance with the received information from the system management terminal 30, updates the various information in the storage unit 200, and stores The reception information (for example, a system switching request to be described later) is transferred to the device control unit 230.

  The activation service unit 220 receives an activation information request from the client terminal 40. When the activation service unit 230 receives an activation information request from the client terminal 40, the activation service unit 230 refers to the maintenance terminal information in the storage unit 200 and determines whether the client terminal 40 that is the transmission source of the activation information request is a maintenance terminal. to decide.

  If the activation service unit 220 determines that the client terminal 40 that is the transmission source of the activation information request is not a maintenance terminal, the activation service unit 220 refers to the system management information in the storage unit 200 and refers to the volume name corresponding to the system “active system”. And activation basic information corresponding to the client terminal 40 that is the transmission source is acquired from the storage unit 200. The activation service unit 220 that has acquired the volume name and activation basic information is activation information based on the activation basic information, and includes activation information having the volume name as the destination volume name and the active system as the destination volume system name. It is generated and transmitted to the client terminal 40 that is the transmission source.

  When the activation service unit 220 determines that the client terminal 40 that is the transmission source of the activation information request is a maintenance terminal, the activation service unit 220 refers to the system management information in the storage unit 200 and corresponds to the system “maintenance system”. While acquiring a name, the starting basic information corresponding to the client terminal 40 which is a transmission source is acquired from the storage unit 200. The startup service unit 220 that has acquired the volume name and startup basic information is startup information based on the startup basic information, and includes startup information with the volume name as the destination volume name and the maintenance system as the destination volume system name. It is generated and transmitted to the client terminal 40 that is the transmission source.

  In addition, when the activation service unit 220 transmits activation information to the client terminal 40, the activation service unit 220 updates the usage state information in the storage unit 200. For example, when the activation service unit 220 transmits activation information having a certain volume name as a destination volume name and an operation system (or maintenance system) as a destination volume system name to a certain client terminal 40, the activation status information is used as usage state information. The destination volume name is stored in association with the client name of the client. The activation service unit 220 also updates the usage state information in the storage unit 200 when receiving a request to end the use of a volume that is in use. For example, when the activation service unit 220 receives a request for terminating the use of the volume from the client terminal 40 using a certain volume, the activation service unit 220 deletes the client name of the client together with the corresponding volume name.

  The storage device control unit 230 acquires various information from the web service unit 210. The storage device control unit 230 transmits various information to the network storage device 10 according to the acquired information from the web service unit 210. Specifically, when the storage apparatus control unit 230 acquires a system switching request, which is a request for system switching, from the web service unit 210, the storage apparatus control unit 230 refers to the system management information and usage state information stored in the storage unit 200. Then, it is determined whether or not the maintenance volume 110 is used by the client terminal 40. That is, the storage apparatus control unit 230 determines whether or not the maintenance volume 110 is in use.

  When the storage device control unit 230 determines that the maintenance volume 110 is not used by the client terminal 40, the storage device control unit 230 refers to the system management information, the usage state information, and the maximum generated number information stored in the storage unit 200 and is currently in use. It is determined whether or not the number of old operational volumes is less than the maximum number N. When the actual generation number M is smaller than the maximum generation number N, the number of old operational volumes in use is always less than the maximum generation number N.

  When the storage device control unit 230 determines that the number of old operational volumes in use is less than the maximum number N, the storage device control unit 230 transmits a system switching command to the volume control unit 110 of the network storage device 10. Specifically, the storage device control unit 230 transmits a replication command to the volume control unit 110 of the network storage device 10. The volume control unit 110 that has received the system switching command from the storage device control unit 230 executes the system switching process in accordance with the system switching command.

  On the other hand, if the storage device control unit 230 determines that the maintenance volume 110 is being used by the client terminal 40, or determines that the number of old operational volumes in use is not less than the maximum number N, the system The switching command is not transmitted to the network storage device 10. The case where the number of old operational volumes in use is not less than the maximum number of generated N is the case where the number of old operating volumes in use is the same as the maximum number of generated N. That is, when the actual generation number M and the maximum generation number N match, specifically, the old generation volume 130 having the maximum generation number N is generated in the storage unit 100 and all of them are in use. This is the case.

  Furthermore, the storage device control unit 230 updates the system management information in the storage unit 200 when transmitting a system switching command to the network storage device 10. Specifically, the storage apparatus control unit 230 changes the system name “active system” to the system name “old operating system” and changes the system name “maintenance system” to the system name “active system”.

  Further, the storage apparatus control unit 230 may transmit a delete command to the network storage apparatus 10 when there is an old operation volume that is not used by the client terminal 40. Note that the storage device control unit 230 may transmit the deletion command as a system switching command, or may transmit the deletion command as a command separate from the system switching command. For example, when the storage device control unit 230 transmits a system switching command to the network storage device 10 and there is an old operation volume that is not used by the client terminal 40, the storage device control unit 230 deletes the unused old operation volume. May be transmitted to the volume control unit 110 of the network storage device 10. The storage device control unit 230 refers to the system management information and the usage state information in the storage unit 200, and specifies the presence / absence of an old operational volume that is not used by the client terminal 40 and the old operational volume name. The volume control unit 110 that has received the delete command from the storage device control unit 230 deletes the old operational volume in accordance with the delete command.

  In addition, when the storage device control unit 230 transmits an unused old operation volume deletion command to the network storage device 10, the storage device control unit 230 updates the system management information in the storage unit 200. Specifically, the storage device control unit 230 refers to the system management information and the usage state information in the storage unit 200, and the system name “old operation” corresponding to the volume name of the old operation volume that is not used by the client terminal 40. System "is deleted together with the predetermined volume name.

  The system management terminal 30 is a terminal used by an administrator and has an Internet browser function. The system management terminal 30 also includes an input reception unit 310 and a communication unit 310. The input receiving unit 310 receives input of various information from the administrator via input devices such as a keyboard and a mouse, for example. The communication unit 320 communicates with the network storage control device 20 using its own Internet browser function and a web service function provided by the network storage control device 20. The system management terminal 30 receives, for example, an instruction to acquire information in the storage unit 200 of the network storage control device 20 or an instruction to update information in the storage unit 200 according to input information from the administrator. To 20 web service units 210. In addition, the system management terminal 30 transmits a system switching request to the web service unit 210 in accordance with input information from the administrator.

  The client terminal 40 is a diskless PC (Personal Computer) that is used by a user and does not have a storage. The client terminal 40 transmits a startup information request to the startup service unit 220 of the network storage control device 20 at startup. The client terminal 40 receives the activation information from the activation service unit 220 after transmitting the activation information request to the activation service unit 220.

  When the client terminal 40 receives the activation information from the activation service unit 220, the client terminal 40 generates a volume read request according to the activation information. Specifically, when the client terminal 40 receives activation information having a certain volume name as the destination volume name and the destination volume system name as the maintenance system, the maintenance volume having the volume identified by the destination volume name as the destination Generate a read request. When the client terminal 40 receives activation information with a certain volume name as the destination volume name and the destination volume system name as the active system, the client terminal 40 generates an operational volume read request with the volume identified by the destination volume name as the destination. . The client terminal 40 that has generated the maintenance volume read request or the operation volume read request transmits the volume read request to the volume control unit 110 of the network storage apparatus 10.

  After transmitting the volume read request to the volume control unit 110, the client terminal 40 acquires a volume corresponding to the volume read request from the network storage device 10. That is, when the client terminal 40 transmits a maintenance volume read request to the volume control unit 110, the client terminal 40 acquires the maintenance volume 110 from the network storage device 10 and transmits an operation volume read request to the volume control unit 110. The operation volume 120 is acquired from 10.

  Note that, when the maintenance volume 110 is acquired, the client terminal 40 performs maintenance of an OS program, an application program, and the like that operate the client terminal 40 according to a user operation. By executing the maintenance, the maintenance volume 110 in the storage unit 100 of the network storage device 10 is updated.

  The system switching process in the network storage system 1 will be further described with reference to FIG. The volume control unit 110 of the network storage device 10 that has received the system switching command (duplication command) from the storage device control unit 230 of the network storage control device 20 duplicates the maintenance volume “M” as shown in FIG. Thus, a new operation volume “BA” is generated. On the other hand, the storage device control unit 230 that transmits the system switching command to the volume control unit 110 changes the system name of the volume “M” of the system management information from “maintenance system” to “operation system” as shown in FIG. ”And the system name of the volume“ AB ”is updated from“ active system ”to“ old operational system ”.

  When the storage device control unit 230 of the network storage control device 20 transmits a delete command including the volume name “AD” to the volume control unit 110 of the network storage device 10, the volume control unit 110 that has received the delete command As shown in FIG. 3A, the old operational volume “AD” is deleted. On the other hand, the storage apparatus control unit 230 that transmits a deletion command including the volume name “AD” to the volume control unit 110 deletes information related to the volume “AD” as shown in FIG.

  Hereinafter, the flow of the system switching process by the network storage control device 20 will be described with reference to FIG. The flowchart illustrated in FIG. 4 starts when the web service unit 210 of the network storage control device 20 receives a system switching request from the communication unit 320 of the system management terminal 30. The same applies to the flowchart shown in FIG.

  The web service unit 210 that has received the system switching request supplies (transfers) the system switching request to the storage device control unit 230. The storage device control unit 230 that has acquired the system switching request from the web service unit 210 refers to the system management information and the usage state information stored in the storage unit 200, and whether or not the maintenance volume 110 is used by the client terminal 40. That is, it is determined whether or not the maintenance volume 110 is in use (step S100).

  When the storage device control unit 230 determines that the maintenance volume 110 is not in use (step S100: No), the storage device control unit 230 refers to the system management information, the usage state information, and the maximum generated number information stored in the storage unit 200 and uses them. It is determined whether or not the number of old operational volumes is less than the maximum number N (step S110).

  When the storage device control unit 230 determines that the number of old operational volumes in use is less than the maximum number N (step S110: Yes), it updates the system management information stored in the storage unit 200. Specifically, the storage apparatus control unit 230 changes the system name “active system” to the system name “old operating system” (step S120), and the system name “old” corresponding to the volume name of the unused old operating volume. “Active” is deleted together with the predetermined volume name (step S130).

  Subsequent to step S130, the storage apparatus control unit 230 transmits a maintenance volume replication command to the network storage apparatus 10 (step S140). Subsequently, the storage device control unit 230 updates the system management information stored in the storage unit 200. Specifically, the storage system controller 230 changes the system name “maintenance system” to the system name “operation system” (step S150). Subsequently, the storage apparatus control unit 230 transmits a delete command to the network storage apparatus 10 (step S160). Subsequently, the storage device control unit 230 transmits the system switching result “normal end” to the communication unit 320 of the system management terminal 30 via the web service unit 210 (step S170). Then, this flowchart ends.

  On the other hand, when the storage device control unit 230 determines that the maintenance volume 110 is in use (step S100: Yes), the system switching result “abnormal” is transmitted to the communication unit 320 of the system management terminal 30 via the web service unit 210. "End (maintenance in progress)" is transmitted (step S180). Then, this flowchart ends.

  On the other hand, when the storage device control unit 230 determines that the number of old operational volumes in use is not less than the maximum number N (step S110: No), the communication unit 320 of the system management terminal 30 via the web service unit 210. The system switching result “abnormal end (exceeded maximum generated number)” is transmitted to (step S190). Then, this flowchart ends.

  In addition, when the maximum generation number N set in the maximum generation number information is very large, for example, when a number far exceeding the maximum number of used old active volumes is set in the maximum generation number information (concept) Specifically, N is infinite), and the process of step S110 may be omitted. That is, in step S100, when the storage apparatus control unit 230 determines that the maintenance volume 110 is not in use (step S100: No), the system name “active system” is changed to the system name “old operating system” (step S100). S120). Thereafter, step S130 and subsequent steps are executed. The number of used volumes is the number of volumes used by the client terminal 40.

  Next, the flow of system switching processing by the network storage system 1 will be described with reference to FIG. The sequence diagram shown in FIG. 5 starts when the system management terminal 30 transmits a system switching request to the network storage control device 20 (Seq1). At the time of disclosure of the sequence diagram shown in FIG. 5, it is assumed that the maintenance volume 110 is unused and the number of old operational volumes in use is less than the maximum number N. The same applies to a sequence diagram shown in FIG.

  The storage device control unit 230 of the network storage control device 20 that has acquired the system switching request acquires the system management information in the storage unit 200 (Seq2 and Seq3). Subsequently, the storage device control unit 230 acquires maintenance-system usage status information in the storage unit 200 (Seq4 and Seq5).

  Subsequently, the storage device control unit 230 determines whether or not the maintenance volume 110 is in use based on the acquired system management information and maintenance system usage state information. The storage device control unit 230 that has determined that the maintenance volume 110 is not in use acquires the maximum number-of-generation information in the storage unit 200 (Seq6 and Seq7). Subsequently, the storage apparatus control unit 230 acquires the usage status information of the old active system in the storage unit 200 (Seq8 and Seq9). It is assumed that the storage apparatus control unit 230 determines that there is an old operational volume that is not used by the client terminal 40 based on the system management information and the usage information of the old operational system.

  Subsequently, the storage apparatus control unit 230 determines whether or not the number of old operating volumes in use is less than the maximum number of generated N based on the acquired system management information, usage state information (old operating system), and maximum generated number information. Determine whether. The storage apparatus control unit 230, which has determined that the number of old operational volumes in use is less than the maximum number N, updates the system management information in the storage unit 200. Specifically, the storage apparatus control unit 230 changes the system name “active system” to the system name “old operating system” (Seq 10), and the system name “old operating system” corresponding to the volume name of the unused old operating volume. System "is deleted together with the predetermined volume name (Seq11).

  Subsequently, the storage apparatus control unit 230 transmits a maintenance volume replication command to the network storage apparatus 10 (Seq12). The volume control unit 110 that has received the replication command from the storage device control unit 230 replicates the maintenance volume according to the replication command.

  Subsequently, the storage device control unit 230 updates the system management information in the storage unit 200. Specifically, the storage apparatus control unit 230 changes the system name “maintenance system” to the system name “operation system” (Seq13). Subsequently, the storage apparatus control unit 230 obtains usage status information (old operational system) in the storage unit 200 (Seq14 and Seq15). It is assumed that the storage apparatus control unit 230 determines that there is an old operational volume that is not used by the client terminal 40 based on the system management information and the usage state information.

  Subsequently, the storage apparatus control unit 230 transmits a delete command to the network storage apparatus 10 (Seq16). The volume control unit 110 that has received the delete command from the storage device control unit 230 deletes the old operational volume in accordance with the delete command.

  Subsequently, the storage device control unit 230 transmits the system switching result “normal end” to the system management terminal 30 via the web service unit 210 (Seq 17). Then, this sequence ends.

  It should be noted that the second acquisition of the usage information of the old active system (Seq14 and Seq15) is carried out for confirmation before actually deleting the old active volume 130 from the network storage apparatus 10, but is omitted. May be.

  In addition, when the maximum generation number N set in the maximum generation number information is very large, for example, when the maximum generation number information is set to a number far exceeding the maximum possible number of the old active volume, The device control unit 230 may omit the determination as to whether or not the number of old operational volumes in use is less than the maximum generated number N. In other words, the storage device control unit 230 changes the system name “active system” to the system name “old system” without determining whether the number of old operating volumes in use is less than the maximum number N of generations. (Seq10). Thereafter, Seq11 and subsequent steps are executed.

  Note that the copy command and the delete command that the storage device control unit 230 of the network storage control device 20 transmits to the external network storage device 10 in Seq12 and Seq16 correspond to system switching commands, but in Seq10, Seq11, and Seq13 Each process in which the storage device control unit 230 updates the system management information in the storage unit 200 is also a process related to the system switching command. In other words, the storage device control unit 230 of the network storage control device 20 transmits a command for updating the system management information to the internal storage unit 200 as a system switching command.

  Incidentally, according to the flowchart of FIG. 4 and the sequence diagram of FIG. 5, in addition to the unused old operation volume 130 at the time of system switching, the unused operation volume 120 at the time of system switching is also a deletion target. On the other hand, an operation in which the unused operation volume 120 is not targeted for deletion at the time of system switching is also conceivable. Hereinafter, another flow of the system switching process of the network storage control device 20 will be described with reference to FIG. Further, another flow of the system switching process of the network storage system 1 will be described with reference to FIG.

  6, step S200 in FIG. 6 is step S100 in FIG. 4, step S210 in FIG. 6 is step S110 in FIG. 4, step S270 in FIG. 6 is step S170 in FIG. 4, and step S280 in FIG. Step S180 in FIG. 4 and Step S280 in FIG. 6 respectively correspond to Step S270 in FIG. Further, step S220 in FIG. 6 is step S130 in FIG. 4, step S230 in FIG. 6 is step S160 in FIG. 4, step S240 in FIG. 6 is step S120 in FIG. 4, and step S250 in FIG. Step S140 and step S260 in FIG. 6 correspond to step S150 in FIG. 4, respectively. That is, the flowchart shown in FIG. 6 is the same as the flowchart shown in FIG. 4 except that the processing order is partially different.

  In FIG. 6, when the maximum generation number N set in the maximum generation number information is very large, for example, a number far exceeding the maximum possible number of used old active volumes is set in the maximum generation number information. In that case, the process of step S210 may be omitted. That is, in step S200, when the storage apparatus control unit 230 determines that the maintenance volume 110 is not in use (step S200: No), the system name “old operating system” corresponding to the volume name of the unused old operating volume. Are deleted together with the predetermined volume name (step S220). Thereafter, step S230 and subsequent steps are executed.

  7, Seq21 in FIG. 7 is Seq1 in FIG. 5, Seq22 in FIG. 7 is Seq2 in FIG. 5, Seq23 in FIG. 7 is Seq3 in FIG. 5, Seq24 in FIG. 7 is Seq4 in FIG. 5 is Seq5 in FIG. 5, Seq26 in FIG. 7 is Seq6 in FIG. 5, Seq27 in FIG. 7 is Seq7 in FIG. 5, Seq28 in FIG. 7 is Seq8 in FIG. 5, and Seq9 in FIG. Seq 29 and Seq 35 in FIG. 7 correspond to Seq 17 in FIG. 7 is Seq11 in FIG. 5, Seq31 in FIG. 7 is Seq16 in FIG. 5, Seq32 in FIG. 7 is Seq10 in FIG. 5, Seq33 in FIG. 7 is Seq12 in FIG. 5, and Seq34 in FIG. Corresponds to Seq13 in FIG. In FIG. 7, the processing corresponding to the second acquisition of usage information of the old operation system, which is the processing of Seq14 and Seq15 of FIG. 5, is omitted. That is, the sequence diagram shown in FIG. 7 is almost the same as the sequence diagram shown in FIG. 5 except that the processing order is partially different. According to the flowchart of FIG. 6 and the sequence diagram of FIG. 7, the unused operational volume 120 at the time of system switching is not deleted, but once becomes an unused old operating volume 130 and is deleted at the next system switching.

  In FIG. 7, when the maximum generation number N set in the maximum generation number information is very large, for example, a number far exceeding the maximum possible number of used old active volumes is set in the maximum generation number information. In this case, the storage apparatus control unit 230 may omit the determination as to whether or not the number of old operational volumes in use is less than the maximum number N. In other words, the storage device control unit 230 determines that the system name “old” corresponding to the volume name of the unused old operation volume is not determined whether or not the number of old operation volumes in use is less than the maximum generated number N. The “active system” may be deleted together with the predetermined volume name (Seq30). Thereafter, Seq31 and subsequent steps are executed.

  Hereinafter, features and effects of the network storage control device 20 constituting the network storage system 1 will be described.

  When the actual generation number M is less than the maximum generation number N, at least one (specifically, N−M) new old operational volumes can be generated in the storage unit 100 of the network storage device 10. In other words, when the actual number of generated volumes M, which is the number of old operational volumes 130 stored in the storage unit 100 of the network storage device 10, is less than the maximum number of generated volumes N managed by the network storage control device 20, Switching to the operation volume is possible. This is because the number of operation volumes is one, and switching is possible if at least one old operation volume can be newly generated. If the operation volume 120 can be switched to the old operation volume 130, in principle, the maintenance volume 110 can be switched to the operation volume 120, with the exception of during maintenance.

  As described above, according to the network storage control device 20 constituting the network storage system 1 of the first embodiment, if the maximum number N is sufficient, maintenance can be performed even when there are users of the old operation volume. Will be able to reflect the contents. Therefore, for example, when urgent maintenance is required that includes application of a security patch and update of a virus definition file, the content of the maintenance can be immediately reflected.

  In the above embodiment, the maximum generation number N is a fixed number, but the maximum generation number N may be a variable number (dynamic number). When the maximum generation number N is a variable number, the storage area in the network storage device 10 can be flexibly managed. Hereinafter, the second and third embodiments to be described are embodiments in which the maximum generation number N is a variable number.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a configuration diagram of the network storage system 2 according to the second embodiment. Since the net storage system 2 according to the second embodiment has a common configuration with the net storage system 1 according to the first embodiment, the same reference numerals as those in the first embodiment are assigned to the common configurations. Some or all of the description will be omitted. The same applies to the network storage system 3 (described later) according to the third embodiment.

  As shown in FIG. 8, the net storage system 2 includes a network storage device 10 and a network storage control device 21. The network storage control device 21 includes a storage unit 201, a web service unit 210, an activation service unit 220, a storage device control unit 230, and a maintenance application information management unit 240.

  The storage unit 201 stores system management information, usage state information, maintenance terminal identification information, startup basic information, maximum generated number information, and maintenance application information. The maintenance application information is information relating to the content of maintenance applied by the client terminal 40. As shown in FIG. 10A, the storage unit 201 stores the type and importance as maintenance application information in association with the maintenance date and time. The maintenance date and time is information indicating the date and time when the maintenance is applied by the client terminal 40, but may be information indicating the date and time when the storage unit 201 stores the information. The type is information indicating the type of the maintenance. The importance level is information indicating the importance level of the content of the maintenance. For example, when the content should be reflected urgently, the importance level is high.

  The maintenance application information management unit 240 receives maintenance application information from the client terminal 40 that is a maintenance terminal that has performed maintenance on the maintenance volume 110. The maintenance application information management unit 240 that has received the maintenance application information updates the maintenance application information in the storage unit 201. The client terminal 40 receives, for example, information necessary for maintenance, such as security patch data, from the outside such as a software vendor site, and the importance associated with the information necessary for the maintenance. May be transmitted to the maintenance application information management unit 240 as the importance level of the maintenance application information.

  Also, the maintenance application information management unit 240 refers to the maintenance application information in the storage unit 201 and updates the maximum generated number information in the storage unit 201 as well. Specifically, for example, the maintenance application information management unit 240 reduces the maximum generation number N when the importance of the maintenance application information is high, and reduces the maximum generation number information so as to increase the maximum generation number N when the importance is low. Update. Note that the maintenance application information management unit 240 may determine the level of importance by scoring importance and comparing it with a predetermined threshold.

  Various timings can be considered for the update timing of the maximum generated number information by the maintenance application information management unit 240. For example, the maintenance application information management unit 240 updates the maximum generation number information when there is an instruction from the storage device control unit 230 to update the maximum generation number information. When the storage device control unit 230 determines that the maintenance volume 110 is not used by the client terminal 40, the storage device control unit 230 notifies the maintenance application information management unit 240 of an instruction to update the maximum generated number information, and manages the maintenance application information management. Reference is made to the maximum generated number information after updating by the unit 240. Further, for example, the maintenance application information management unit 240 may update the maximum generated number information every time the maintenance application information is stored in the storage unit 201.

  As described above, according to the network storage control device 21 configuring the network storage system 2 of the second embodiment, in addition to the same effects as the network storage control device 20 configuring the network storage system 1 of the first embodiment, a network The storage area in the storage device 10 can be flexibly managed. For example, when the importance of maintenance is extremely high, the contents of the maintenance are performed by quickly logging out a client terminal that uses the operation volume or the old operation volume, that is, a client terminal that is logged in to the network storage device 10. It becomes possible to avoid the continuous use of the volume before reflecting.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. The network storage system 3 according to the third embodiment includes a network storage device 10 and a network storage control device 22 as shown in FIG. The network storage control device 22 includes a storage unit 202, a web service unit 210, an activation service unit 220, and a storage device control unit 232.

  The storage unit 202 stores system management information, usage state information, maintenance terminal identification information, startup basic information, maximum generated number information, and old operational volume usage record information. The old operational volume usage record information is information relating to the usage record of the maintenance volume 110. As shown in FIG. 10B, the storage unit 202 stores the number of uses as old operational volume usage record information in association with the confirmation date and time. The confirmation date and time is information indicating the date and time when the storage device control unit 232 confirms the number of used old operational volumes.

  The storage device controller 232 confirms the number of used old operational volumes. For example, the storage device control unit 232 confirms the number of old operational volumes used when determining whether the number of old operational volumes in use is less than the maximum number N of generations. The storage device control unit 232 confirming the number of used old operational volumes updates (adds) old used volume usage record information in the storage unit 202.

  Further, the storage device control unit 232 refers to the old operational volume usage record information in the storage unit 202 and similarly updates the maximum generated number information in the storage unit 202. Specifically, the storage device control unit 232 calculates an appropriate maximum generated number N from the old operational volume usage record information in the storage unit 202 and updates the maximum generated number information. Various methods can be considered as a method for calculating an appropriate maximum number N of generations. For example, the storage apparatus control unit 232 may calculate an average value obtained by simply averaging the past usage numbers as an appropriate maximum generation number N. Further, the storage apparatus control unit 232 may calculate an average value obtained by weighted averaging the past numbers of uses as an appropriate maximum number N of generations. Note that the storage device control unit 232 may give a high coefficient to the number of recent uses when calculating the weighted average value.

  Various timings can be considered for the update timing of the maximum generated number information by the storage device control unit 232. The storage device control unit 232 updates the maximum generated number information when the old operational volume usage record information in the storage unit 202 is updated. When the storage device control unit 232 determines that the maintenance volume 110 is not used by the client terminal 40, the storage device control unit 232 updates the maximum generated number information and refers to the updated maximum generated number information.

  As described above, according to the network storage control device 22 configuring the network storage system 3 of the third embodiment, in addition to the same effects as the network storage control device 20 configuring the network storage system 1 of the first embodiment, a network The storage area in the storage device 10 can be flexibly managed. That is, the optimum maximum generation number N can be determined based on the usage record of the old operation volume. It should be noted that the storage area of the storage area of the network storage device 10 can be saved, so that the storage area of the network storage apparatus 10 can be used for storage other than the volume.

  Although the network storage control device 20 of the first embodiment is separate from the network storage device 10, the network storage device 10 and the network storage control device 20 may be the same casing. That is, the network storage device 10 may have the function of the network storage control device 20. In other words, the network storage control device 20 may have the function of the network storage device 10. The same applies to the network storage control device 21 of the second embodiment and the network storage control device 22 of the third embodiment.

  The network storage control device 20 (21, 22) may include an input receiving unit (not shown) that receives an input of information related to system switching from the administrator. When the network storage control device 20 (21, 22) includes an input reception unit (not shown), the storage device control unit 230 receives the input reception instead of or in addition to acquiring the system switching request from the web service unit 210. Information related to system switching (corresponding to system switching request) may be acquired from a unit (not shown).

  Note that a program for executing each process of the network storage systems 1, 2, and 3 according to an embodiment of the present invention is recorded on a computer-readable recording medium, and the program recorded on the recording medium is stored in the computer system. The various processes described above related to the network storage systems 1, 2, and 3 according to the embodiment of the present invention may be performed by reading and executing the processes. Here, the “computer system” may include an OS and hardware such as peripheral devices. Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used. The “computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a CD-ROM, a hard disk built in a computer system, etc. This is a storage device.

  Further, the “computer-readable recording medium” means a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time. The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

1, 2, 3 Network storage system 10 Network storage device 20, 21, 22 Network storage control device 30 System management terminal 40 Client terminal 100 Storage unit 110 Maintenance volume 120 Operation volume 130 Old operation volume 110 Control unit 200, 201, 202 Storage Unit 210 web service unit 220 activation service unit 230, 232 storage device control unit 240 maintenance application information management unit 310 input reception unit 320 communication unit

Claims (6)

A network storage device that stores a plurality of volumes, which are management units for information necessary for the operation of a client terminal, a maintenance volume that is a maintenance volume, and a volume after the system switching of the maintenance volume, A network storage control device that controls an operation volume that is a volume and a network storage device that stores the old operation volume that is a volume after the system switching of the operation volume and is an old operation system volume;
Storage that stores the current system management information indicating the system of each volume, the usage status information indicating the usage status of the volume by the client terminal, and the maximum generated number of old operational volumes that is two or more as the maximum generated number information And
When switching the system, refer to the system management information, the use state information and the maximum generated number information in the storage unit, and when the number of old operating volumes in use is less than the maximum generated number, the system switching is performed. A network storage control device comprising: a storage device control unit that transmits a system switching command to the network storage device. The maximum generation number is
The network storage control apparatus according to claim 1, wherein the network storage control apparatus is the maximum number of the old operational volumes that can be stored in the network storage apparatus. The storage device control unit
The system management information and the usage state information in the storage unit are referred to, and a deletion command that is a command related to deletion of the old operational volume that is not used by a client terminal is transmitted to the network storage device. The network storage control device according to claim 1 or 2. The storage device control unit
4. The network storage control device according to claim 1, wherein when the maintenance volume is used by a client terminal, the system switching command is not transmitted to the network storage device. 5. A network storage system comprising a network storage device that stores a plurality of volumes that are management units of information necessary for operation of a client terminal, and a network storage control device that controls the network storage device,
The network storage device
A maintenance volume that is a maintenance volume, a volume that has been switched from the maintenance volume to the active volume that is the active volume, and a volume that has been switched from the operating volume to the old operational volume. A storage unit for storing a certain old operational volume
The network storage controller is
Stores system management information indicating the current system of each volume, usage status information indicating the usage status of the volume by the client terminal, and maximum generated number information indicating the maximum generated number of old operational volumes that is two or more. A storage unit;
When switching the system, refer to the system management information, the use state information and the maximum generated number information in the storage unit, and when the number of old operating volumes in use is less than the maximum generated number, the system switching is performed. A network storage system comprising: a storage device control unit that transmits a system switching command that is a command to the network storage device. A network storage device that stores a plurality of volumes, which are management units for information necessary for the operation of a client terminal, a maintenance volume that is a maintenance volume, and a volume after the system switching of the maintenance volume, A network storage control method for controlling a network storage device that stores an operation volume that is a volume and an old operation volume that is a volume after system switching of the operation volume and is an old operation volume,
Stores system management information indicating the current system of each volume, usage status information indicating the usage status of the volume by the client terminal, and maximum generated number information indicating the maximum generated number of old operational volumes that is two or more. Steps,
When switching the system, refer to the system management information, the use state information and the maximum generated number information in the storage unit, and when the number of old operating volumes in use is less than the maximum generated number, the system switching is performed. And a step of transmitting a system switching command, which is a command to the network storage device, to the network storage control method.

Images