JPH0540704A - System for verifying backup data - Google Patents

Abstract

PURPOSE:To insure data saved by a large capacity backup device without a master disk by providing a check block preparing means, a check block reading means and a check block collating means. CONSTITUTION:When data backed-up at the time of saving data on a magnetic disk device 17 in the large capacity backup device 16 is verified, the check block preparing means 12 prepares a block to verity the data and the check block reading means 13 reads the block. The check block collating means 14 collates the read block and actual data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup data verification system, and more particularly to a backup data verification system for an information processing system to which a large capacity backup device is connected.
Data verification method

[0002]

2. Description of the Related Art Conventionally, only the function of backing up (saving / resume) a large amount of data has been available. That is, there is only a function of mass data from a magnetic disk to a backup medium (save) or mass data from a backup medium to a magnetic disk (resume). Therefore, the guarantee of the saved data was the first to be verified after the resume.

[0003]

Although the conventional backup data verification method described above can save / resume a large amount of data, it does not have the function of performing only verification, and the guarantee of saved data is resumed. However, the backup data is not assured because it was proved for the first time.

An object of the present invention is to solve the above drawbacks and to provide a backup data verification method in an information processing system to which a large capacity backup device is connected.

[0005]

[Means for Solving the Problems] Backup of the present invention
When verifying the backed up data, the data verification method is a check block creation method that creates a block diagram for verifying the data, a check block reading method that reads the block to verify the data, and the read block and the actual block. Check block collating means for collating the data.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. Referring to FIG. 1, the backup data verification method of this embodiment uses an information processing apparatus main body 11, a check block creating means 12 for creating a block for verifying data when verifying the backed up data, and data verification. Therefore, a main part thereof includes a check block reading unit 13 for reading a block, a check block matching unit 14 for matching the read block with actual data, a main memory 15, a large-capacity backup device 16, and a magnetic disk device 17. To be done. FIG. 2 is a structural diagram showing an example of the conventional logical structure and the logical structure of the present invention on the medium of the large capacity backup device.

In this embodiment, as shown in FIG. 2B, it is composed of a data block 21 and a check block 22.

FIG. 3 is a block diagram showing the check block in FIG. In FIG. 3, the check block used in this embodiment is composed of a check code 31 of the data block i, which is a check code such as a checksum of the data block i, and a check code 32 of the check codes of the data blocks 1 to n. It

FIG. 4 is an example of a flow chart of the check block creating means in FIG. In FIG. 4, the process is
Step 41 of generating the check code of the data block i, Step 4 of storing the generated check code
2. Step 44 of generating check codes of check codes 1 to n.

FIG. 5 is an example of a flow chart of the check block collating means in FIG. In FIG. 5, the process is
It comprises a step 51 of calling a check block creating means by a subroutine and a step 52 of comparing the read check code with the generated check code.

Next, the operation of the backup data verify method according to the present embodiment will be described.

When saving the data on the magnetic disk device 17 to the large-capacity backup device 16, the check block creating means 12 is used, and the check block 22 is added between the data blocks 21 as shown in FIG. As shown in FIG. 3, the specification of the check block is a check code 31 of n data blocks and a check code 32 of the check code. The added check block 22 is checked block reading means 1
By reading with 3 and checking with the check block checking means 14, it is possible to guarantee the save data without resuming the data to the magnetic disk device 17 one by one.

[0014]

As described above, the backup data verifying method of the present invention has the check block creating means, the check block reading means, and the check block collating means, so that the data saved in the large capacity backup device is saved. Has the effect of improving the quality of guaranteeing data without a master disk.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a backup data verification method of the present invention.

FIG. 2 is a diagram showing a conventional logical structure on a medium of a large capacity backup device and a logical structure according to the present invention.

FIG. 3 is a configuration diagram showing a check block shown in FIG. 2 (b).

FIG. 4 is a flowchart showing the processing in the check block creating means shown in FIG.

5 is a flow chart showing processing in the check block matching means shown in FIG.

[Explanation of symbols]

 11 information processing device main body 12 check block creating means 13 check block reading means 14 check block collating means 15 main memory 16 large capacity backup device 17 magnetic disk device 21 data block i 22 check block 31 check code of data block i

Claims (1)

[Claims] 1. In an information processing system connected to a large-capacity backup device, when verifying data backed up using the backup device,
Check block creating means for creating blocks for verifying data, check block reading means for reading blocks for verifying data, and check block matching means for matching the read blocks with actual data A method of verifying backup data, which is characterized by verifying the backed up data.