JPS61109161A - Back-up recovery system for volume - Google Patents

Abstract

PURPOSE:To perform the back-up recovery at a high speed and with high efficiency by using the propriety of writing to a volume as the fetching standard of the volume. CONSTITUTION:The rewriting processing is tried when the operating volumes 1 having the same volume serial number are fetched together with the back-up volumes 2. Thus a volume which is capable of rewriting is fetched. In a normal operating mode the volumes 1 and 2 are set under the writable and unwritable states respectively. Then the volume 1 is fetched. In case the volume 1 has a fault, etc. and is inapplicable, the volume 1 is set in the writing unable state with the volume 2 set in the writable state respectively. The volume 2 is fetched.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bank-up/recovery method for each volume in a data processing device.

In a data processing device, a management unit of a data medium in an external storage device that stores files and the like is called a "volume."

In a system that performs data processing operations, it is common to have two sets of volumes to prepare for failures in devices or media. When a failure occurs in the volume currently in operation, the shorter the time required to switch to the backup volume, the better.

[Prior Art] Conventionally, there are the following two methods as a volume back amplifier recovery method.

(1) Method of saving and restoring to a storage format volume (2) Full copy method (1) The method of saving and restoring to a storage format volume of (1) is a completely different format from normal operation, in which only the necessary parts are stored in each library. It should be recorded as.

The full-scale copying method (2) records the data as a complete copy.

[Problems to be Solved by the Invention] The conventional two-volume bank-up recovery method described above has the following problems, and is unsuitable especially when high-speed backup and recovery is required.

The method (1) of saving and restoring data to a storage format volume has the disadvantage that it takes a long time to restore the storage format from a storage format that is completely different from normal operation to the normal operation format.

In addition, in the full-scale copying method (2), - In a system that is originally connected, the same volume serial number (a serial number for identifying the volume, recorded on the volume label when the volume is initialized), Furthermore, since the same library name is not allowed, there is a drawback that the copy destination volume must be removed, and backup and recovery also take a considerable amount of time.

The present invention aims to provide a backup/recovery method that is gentler, faster, and more efficient than the conventional backup/recovery method described above.

[Means for Solving the Problems] The above problems are solved by the volume bank amplifier recovery method of the present invention, which is configured to use whether or not writing to the volume is possible as a criterion for reading the volume.

[Operation] That is, by using the write prohibition mechanism of the volume device, when importing an operational volume and a bank-up volume that have the same volume serial number, a rewrite process is performed to import a volume that can be rewritten. In normal operation, the working volume is made writable, the backup volume is made writable, and the working volume is imported. If the working volume is unavailable due to a failure, the working volume is made writable, and the backup volume is set to writable. The backup volume is made writable and the backup volume is imported.

[Example] The gist of the present invention will be specifically explained below using examples shown in FIGS. 1 and 2.

FIG. 1 is a block diagram of essential parts of an embodiment of the present invention.

(a) in the figure shows the normal operating state, and (bl shows the operating state at the time of failure. In the figure, 1 indicates the operating volume,
2 each indicate a backup volume.

Under normal operating conditions, the protect switch for operation volume 1 is “off” and the bank-up
The protect switch for volume 2 is "on".

When initializing the system, that is, initializing the system by loading an initial program, the magnetic disk volumes connected to the system are loaded. At this time, magnetic disks with the same volume serial number
If there is a volume, the volume label (a block that contains information such as the volume serial number and owned note name and is used to identify the volume) that has been read is rewritten, and the magnetic disk that is rewritable is rewritten.・Include volume.

During system operation, the entire operation volume is periodically copied to the bank-up volume, and normally the protection switch of the operation volume is set to "off", that is, it is writable, and the backup volume is copied. Turn the protect switch "on", that is, disable writing, and import the operational volume.

If the operating volume becomes unusable due to a hardware failure, etc., set the operating volume's protect switch to "1 on" and the back amplifier volume's "off" switch to initial program loading. and import the backup volume.

In this way, by using the write protection detection mechanism of the volume device and using the ability to write to the volume as the criterion for importing the volume, bank-up recovery in response to a failure during use of the operational volume can be performed quickly and efficiently. It can be done efficiently.

FIG. 2 is a block diagram of main parts of another embodiment of the present invention. In the figure, 3, 4, 5. are operational volumes A, B,
C and 6 indicate bank-up volume.

The backup volume 6 has a large storage capacity and contains the contents A of the plurality of operational volumes 3.4.5.

B and C are backed up in content units.

In the normal operating state, as shown in the figure, the operating volume 3
, 4.5 are set to "off",
Turn on the protect switch of backup volume 6, import operational volume 3.4.5, and execute the job.

If either operation volume 3 or 4.5 becomes unusable due to a failure or the like while a job is being executed, turn on each protect switch of operation volume 3.4.5.
Set the protect switch of bank-up volume 6 to 1 OFF, import backup volume 6, and restart business.

According to the method of the embodiment shown in FIG. 2, performance can be improved by reducing the number of backup volumes and increasing the number of operational volumes within the limited number of subchannels per channel, that is, the number of devices. This has the effect of distributing the load on the device.

[Effects of the Invention] As explained above, the present invention enables volume backup and recovery to be performed quickly and efficiently, and has the effect of minimizing system down time. It becomes possible to handle tasks that required bank up and recovery, which were previously impossible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part of one embodiment of the present invention, and FIG. 2 is a block diagram of a main part of another embodiment of the invention. In the drawing, 1.3.4.5 indicates the operational volume, and 2.6 indicates the backup volume.

Claims (1)

[Claims] A data processing system configured with a volume device equipped with a write protection detection mechanism, characterized in that the data processing system is configured to use whether writing to the volume is possible as a criterion for importing the volume.
Recovery method.