JPS586182B2 - Cartridge multiplex recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cartridge multiplex recording system, and more particularly, the present invention relates to a cartridge multiplex recording system, and in particular, uses a plurality of magnetic tape cartridges as storage media, uses magnetic disk devices as first and second auxiliary storage media, and uses the fourth auxiliary storage medium. This invention relates to a method for multiplex recording data on a storage medium onto a cartridge.

Ultra-large capacity storage (mass storage) of conventional electronic computers
In a system, data on a magnetic disk (hereinafter simply referred to as a disk) is stored in a plurality of magnetic tape cartridges (hereinafter referred to as a cartridge), and the data is stored in a central processing unit (CP).
(referred to as U).

In this case, a method is adopted in which the CPU sends a command to the mass storage system each time data on the disk is stored in one cartridge.

FIG. 1 is a block diagram showing a conventional system.

The CPUI in the figure performs control as the core of the computer system, such as allocating jobs to the mass storage system.

The mass storage control device 2 controls the entire mass storage system and manages data.

The cartridge store 3 includes a cartridge storage, an access mechanism, and a control device thereof (not shown).

The access mechanism transports cartridges between the cartridge storage and the recording mechanisms 6 and 7.

Cartridges 4 and 5 are taken out from cartridge store 3 and set in recording mechanisms 6 and 7, whereby data is exchanged with disk 10.

The recording mechanisms 6, 7 write information to the cartridges 4, 5 and read information from the cartridges.

The recording mechanism control device 8 controls the recording mechanisms 6 and 7 according to commands from the mass storage control device 2 and the adapter 11, which is a disk control device.

The disk 9 operates as a normal magnetic disk device for auxiliary storage.

The disk 10 operates as a main memory (not shown) in the CPUI and as an auxiliary storage magnetic disk located in cartridges 4 and 5 of the mass storage system.

The adapter 11 controls, for example, the control of the disk 9, which is the control of information transfer between the main memory of the CPU 1 and the disk 9, the information transfer between the cartridges 4 and 5 and the disk 10, and the control of the information transfer between the main memory of the CPU 1 and the disk 10. performs disk control, which is the control of information transfer between

The data buffer store 12 is a buffer memory provided to absorb the difference in speed between the cartridges 4, 5 and the disk 10 when information is transferred between the two.

The information on the disk 10 is transferred from the CPU to the mass storage controller 2 via the interface line to the cartridge 4.
When a command is given to store data in
), and at the same time instructs the cartridge store 3 to set the cartridge 4 in the recording mechanism 6.

When the cartridge 4 is set in the recording mechanism 6 and becomes operational, an interrupt is reported to the mass storage controller 2 via the recording mechanism controller 8 and the adapter 11.

The mass storage control device 2 determines that the cartridge 4 is in a writable state, and then sends a command to the adapter 11 to start operation.

The adapter 11 transfers one block of data on the disk 10 to the data buffer store 12, and then transfers the contents of the data buffer store 12 to the cartridge 4 via the recording mechanism control device 8 and the recording mechanism 6. do.

This operation is repeated for the number of blocks specified by a command from the host, and the data on the disk 10 is stored in the cartridge 4.

When data on the disk 10 is stored in a plurality of cartridges, the CPU 1 specifies different cartridges and repeats the above operation a plurality of times.

In this case, the data transfer path between the disk 10 and the data buffer store 12 has many parts in common with the data transfer path between the disk 9 and the main memory, so the data on the disk 10 is transferred to the data buffer store 12. During storage, the adapter 11 cannot accept jobs to the disk 9 that is frequently accessed.

Therefore, when performing multiple recording on cartridges, the processing capacity of the entire system decreases.

Note that the broken lines in FIG. 1 indicate the flow of data.

Conventionally, multiplex recording on cartridges was achieved by sending multiple commands from the CPU 1 to the mass storage system to instruct the mass storage system to store data on the disk 10 in the cartridge, so the processing capacity of the mass storage system was limited. It has the disadvantage of being significantly reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cartridge multiplex recording system that eliminates the above-mentioned conventional drawbacks and increases the throughput of the system.

The system of the present invention includes a plurality of cartridges, a first auxiliary memory for storing data to be sent to these cartridges, a second auxiliary memory for transmitting and receiving data to and from a central processing unit, and both of the auxiliary memories. A mass storage system comprising: an adapter that controls storage operations; a data buffer storage used during data transfer between the cartridge and the first auxiliary storage; and a control device that controls the entire mass storage system. In the case where information of the same content on the first auxiliary storage is stored in the plurality of cartridges for multiplex recording, the information on the first auxiliary storage is stored in the plurality of cartridges by one command given from the central processing unit to the system via the control device. 1
The present invention is characterized in that after data is read from the auxiliary memory into the data bath sofa memory, the data is serially transferred to the plurality of cartridges.

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

FIG. 2 is a diagram for explaining one embodiment of the present invention, and the hardware configuration and names of each component are almost the same as in FIG. 1, including a CPU 1, a mass storage control device 2, and a cartridge store 3. and cartridge 4 for double recording.
, 5, recording mechanisms 6 and 7, a recording mechanism control device 8, a disk 9, a disk 10, an adapter 11, and a data bath store 12.

In this embodiment, in response to a cartridge double recording command from the CPU 1, the mass storage control device 2 instructs the cartridge store 3 to set the specified cartridges 4 and 5 in the specified recording mechanisms 6 and 7. Two recording mechanisms 6, 7 that serve as paths through which data is transferred during data sending operation from the cartridges 4, 5 to the disk 10.
and one or two recording mechanism control devices 8.

The adapter 11 transfers one block worth of data on the disk 10 to the data buffer store 12.

Thereafter, the contents of the data buffer store 12 are transferred to the cartridge 5 via the recording mechanism control device 8 and the recording mechanism 7. When this transfer operation is completed, the adapter 11 transfers the data buffer store 1 consisting of a non-destructive IC memory, etc.
The same data stored in the cartridge 2 is transferred to the cartridge 4 via the recording mechanism control device 8 and the recording mechanism 6.

This series of operations is repeatedly executed by the number of blocks specified by a command from the CPU 1, and the same data on the disk 10 is stored in the two cartridges 4 and 5.

In this method, the information transfer path between the disk 9 and the CPUI is not used while data is being transferred between the data bus store 12 and the two cartridges 4 and 5, so it is difficult to accept jobs to the disk 9, which is frequently accessed. Execution is also possible during cartridge dual recording.

One block of data on disk 10 is transferred to cartridge 4.
, 5, a time chart of the conventional method is shown in FIG. 3, and a time chart of the present method is shown in FIG. 4.

Time A is the time when the disk 10 is in use and includes access time and data transfer time.

Time B indicates the data transfer time between the disk 10 and the data buffer store 12.

Time C is from data buffer store 12 to cartridge 4.
, 5 indicate the time at which data is transferred.

As the time B shown on the time chart decreases, the control time for the disk 9 increases, and the processing capacity of the system increases.

3 and 4 show double recording of one block of data on the disk 10.
It is clear that the processing capacity of the system according to this method increases as the number of blocks of the above data increases and as the number of multiplexed recordings increases.

As explained above, in the method of the present invention, the data buffer store 12, which was conventionally placed to absorb the speed difference between the cartridge and the disk 10 during data transfer, is used to transfer the data onto the disk 10 only once. Since the data is stored and serially written to multiple cartridges, the data transfer time between the data buffer store 12 and the disk 10 is shortened. The idle time of the control section is longer than that of the conventional method, making it possible to accept jobs to the disk 9 that is frequently accessed, and improving the processing capacity of the system.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the conventional system, FIG. 2 is a diagram showing an embodiment of the present invention, and FIGS. 3 and 4 are diagrams for comparing the operations of the conventional system and the system of the present invention, respectively. be. In FIG. 1 and FIG. 2, 1...CPU,
2... Mass storage control device, 3...
・Cartridge store, 4, 5... Cartridge, 6, 7... Recording mechanism, 8... Recording mechanism control device, 9, 10... Disk, 11・
...Adapter, 12...Data bath store.

Claims (1)

[Claims] 1 A plurality of magnetic tape cartridges, a first auxiliary memory that stores data to be sent to these cartridges, and a second auxiliary memory that is provided separately from the auxiliary memory and is used for data transmission and reception between the central processing unit L. an auxiliary storage, an adapter that controls the operation of both of the auxiliary storages, a data buffer storage that is used during data transfer between the cartridge and the first auxiliary storage, and a control that controls the entire mass storage system. When data of the same content on the first auxiliary storage of a mass storage system having a device is stored in the plurality of magnetic tape cartridges and multiplexed recorded, the central processing unit provides the data through the control unit. A single command to the system causes data to be read from the first auxiliary memory to the data buffer memory and then serially transferred to the plurality of magnetic tape cartridges. Cartridge multiple recording method.