JPH0247028B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk control device, and particularly to a mutual transfer operation of storage contents between a fixed magnetic storage device and a backup storage device in order to preserve the storage contents of the fixed magnetic disk device. The present invention relates to a magnetic disk control device that performs control.

In recent years, as the storage density of magnetic disk devices has increased, fixed magnetic disk devices have been increasingly adopted in order to improve and maintain device reliability. Since the structure of the magnetic disk, which is the storage medium, cannot be replaced, in the unlikely event that the stored contents are destroyed due to an accident, it will be impossible to restore them. Processing may become impossible.

In order to prevent such serious accidents, in information processing systems that use fixed magnetic disk devices (hereinafter referred to as disk devices), backup storage devices (generally This is called backup memory), and the storage contents (programs and data) of the disk device are transferred to and stored in the backup memory.In the event that the storage contents of the disk device are destroyed, the backup memory A method is used to preserve the storage contents of a disk device by reading from and rewriting.

In conventional information processing systems, the above-mentioned transfer and storage operation to the backup memory is usually performed just before the end of the day's work.
Since this transfer storage operation requires a considerable amount of time, the normal business processing time is limited by that amount, and this trend is becoming more and more common as the storage capacity of disk devices becomes larger.

A first object of the present invention is to eliminate the above-mentioned inconveniences, and also to prevent the normal business processing time of an information processing system from being limited by the operation of transferring storage contents to a backup memory, thereby reducing the time of the system. An object of the present invention is to provide a magnetic disk control device that can configure an economical information processing system with high usage efficiency.

A second object of the present invention is to provide a magnetic disk control device that can detect that storage content has been updated during a storage content transfer operation and re-execute the transfer operation.

The magnetic disk control device of the present invention is a magnetic disk control device that controls the mutual transfer operation of storage contents between a fixed magnetic disk device and a backup storage device, and receives a transfer command from a processing device and performs the operations described above. a first storage means for storing a range of block addresses of the fixed magnetic disk device pointed to by the transfer command; and a first storage means for storing a range of block addresses of the fixed magnetic disk device pointed to by the write command upon receiving a write command from the processing device. a second storage means for storing the block addresses of the first storage means and the second storage means, and a comparison means for outputting an update signal indicating that there is a matching portion by comparing the block addresses of the first storage means and the second storage means; storage means for temporarily storing memory contents to be transferred from the disk device to the support storage device; and upon receiving the transfer instruction from the processing device, storing the memory contents at the block address of the fixed magnetic disk device pointed to by the transfer instruction. A transfer operation is performed in which the data are sequentially read into the storage means and sequentially stored in the support storage device, and when a write command is received from the processing device, the transfer operation is interrupted and a write operation is performed according to the write command. and control means for continuing the transfer operation after the transfer operation has been performed, but for causing the transfer operation to be redone including the transferred portion when receiving an update signal from the comparison means.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows its time chart. In FIG. 1, this embodiment is a magnetic disk control device 10 that controls mutual transfer of storage contents between a fixed magnetic disk device 14 and a backup storage device 15, and a processing device (not shown). It is connected. This magnetic disk control device 10 includes a first storage means 11 and a second storage means 16 for storing block addresses of a fixed magnetic disk device 14, and a first storage means 11 and a second storage means 16.
means 17 for comparing each block address with the second storage means 16; storage means 13 for temporarily storing the memory contents of the fixed magnetic disk device 14 or the support storage device 15; and a control means 12 for controlling.

A first storage means (hereinafter referred to as a register) 11 receives a transfer command (hereinafter referred to as a "SAVE" command) 101 from a processing device and stores the block address of the disk device 14 (a processing unit of the disk device) included in the "SAVE" command. The buffer memory 13 has the role of storing the start block address and end block address of the specified address (specified address of It has the role of temporarily storing stored contents when transferring them to the up memory 15. In addition, a second storage means (hereinafter referred to as a register)
16 receives a write command (hereinafter abbreviated as "WRITE" command) 103 from the processing device, stores the block address of the disk device 14 included in the "WRITE" command, and sends a message from the control section 12 during the write operation to the disk device 14. The comparator 17 has a function of updating the disk address to indicate the block address currently being written in accordance with the operation command 105 of the register 16. It has the function of sending the operation command 106 to the control unit 12 if it is included in the range.

The control unit 12 also receives a “SAVE” command 101, a “WRITE” command 103, and write data 104 from the processing device, and also receives a “SAVE” command 101, a “WRITE” command 103, and write data 104.
During command operation, register 11 and register 1 receive operation command 106 from comparator 17.
6. Operation commands 102, 10 to the buffer memory 13, disk device 14 and backup memory 15
It is responsible for sending out signals 5, 107, 108 and 109 and instructing their operations.

The magnetic disk control device configured as described above operates as follows.

That is, “SAVE” command 1 from the processing device
When 01 is input to the register 11 and the control section 12, the register 11 stores the block address included in the "SAVE" command and waits for a command from the control section 12. At this time, if the "WRITE" command 103 is input to the control unit 12 and a write operation is being performed on the disk device 14, the control unit 12 suspends the execution of the "SAVE" command (reference numeral A in FIG. 2). After a predetermined period of time has elapsed after the end of this write operation (see reference numeral B in FIG. 2), the block address is received from the register 11, and a transfer operation is commanded to the buffer memory 13, disk device 14, and backup memory 15, and "SAVE" is executed. ” Execute the command (reference number c in Figure 2).

When the next "WRITE" command 103 is input to the control unit 12 while this transfer operation is being executed, the control unit 12 issues commands to the buffer memory 13, disk device 14, and backup memory 15 to write the block being transferred. At the break, the transfer operation is interrupted and a write operation of the disk device 14 is executed (reference numeral d in FIG. 2), and at the same time as this write operation is completed, the interrupted transfer operation is executed again (reference numeral 2 in FIG. 2). e).

By repeatedly suspending and resuming such transfer operations, the disk device 1 for normal business processing is
During the write operation in step 4, the storage contents of the disk device 14 can be transferred and stored in the backup memory using the pause time.

On the other hand, while executing the “SAVE” command, register 16 is stored within the range of the block address of register 12.
If the block address is included, the operation command 106 from the comparison section 17 is sent to the control section. This means that the memory contents transferred by executing the "SAVE" command have been updated by the "WRITE" command, so the control unit 12 retries the "SAVE" command based on this command and backs up the data. The updated storage contents can be transferred and stored in the up memory 15 again.

Therefore, by using the magnetic disk device control device of the present invention, the information processing system is not exclusively used for mobile operations, so it is possible to configure an economical information processing system with high system usage efficiency. There is an effect that it can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a timing chart showing the operation of the embodiment shown in FIG. 11...Register, 12...Control unit, 13...
Buffer memory, 14... fixed magnetic disk device (disk device), 15... support storage device (backup memory), 16... register, 17
...Comparison section.

Claims (1)

[Scope of Claims] 1. A magnetic disk control device that controls mutual transfer of storage contents between a fixed magnetic disk device and a backup storage device, which receives a transfer instruction from a processing device and executes the transfer instruction. a first storage means for storing a range of block addresses of said fixed magnetic disk device pointed to by said processing device; and a first storage means for storing a range of block addresses of said fixed magnetic disk device pointed to by said write instruction upon receiving a write command from said processing device. a second storage means for comparing the block addresses of the first storage means and the second storage means and outputting an update signal indicating that there is a matching portion; and the fixed magnetic disk device. storage means for temporarily storing storage contents to be transferred from the storage device to the support storage device; upon receiving the transfer instruction from the processing device, sequentially storing the storage contents at the block address of the fixed magnetic disk device pointed to by the transfer instruction; performs a transfer operation of reading data into the storage means and sequentially storing it in a support storage device, and when receiving a write command from the processing device, interrupts the transfer operation and performs a write operation according to the write command; , a control means for continuing the transfer operation, but when receiving an update signal from the comparing means, for redoing the transfer operation including the transferred portion.