JPH0580950A - Defective disk block substitution system for exchange system - Google Patents

Abstract

PURPOSE:To substitute a defective block without interrupting the use of a disk device if the defective block is generated on the disk device under the control of the maintenance operation device of the exchange system. CONSTITUTION:If the defective block is generated during the writing to the disk device 3A by the maintenance operation device 1, a defective block substitution controller 4 substitutes the block through a defective block substitution device 5A, after the defective block is substituted, rewriting is performed. When the defective block is generated, after the defective block is substituted, the contents of the block in the same address of the disk device of an opposite system are also read in by the defective substitution controller 4 and written in the substitution block of the disk device of the system where the defective disk block is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a maintenance operation device of 0 series, 1 series.
The present invention relates to a defective disk block replacement method in a replacement system having a redundant disk device.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing an example of a conventional defective disk block replacement method, and FIG. 4 is a flow chart for explaining the operation in FIG.

When the maintenance operation device 1 accesses the disk device 3A via the input / output control device 2, for example, when a bad block occurs, it is detected (step 41) and the use of the disk device 3A is stopped (step 41). Step 43),
In that state, a command is input from the terminal device 8, the defective disk block area 6 is replaced by the defective block replacement device 5A (step 43), and the disk device 3B of the opposite system is used.
Then, all the blocks are copied (step 44) to restore the disk, and then the use of the disk device 3A is restarted (step 45).

[0004]

In the conventional defective disk block replacement method described above, if a defective block occurs while the maintenance and operation device 1 is accessing the disk device 3A via the input / output control device 2, the disk of the opposite system will be used. Since it is used after copying all disk blocks from the device 3B, there is a drawback that only one disk device 3B can be used until the copying of all disk blocks is completed, and a defective disk block occurs. There was a drawback that it took a long time to restore the system disk unit.

[0005]

DISCLOSURE OF THE INVENTION A defective disk block replacement method according to the present invention is a dual disk device of 0 system and 1 system as an external storage device of a maintenance operation device, and an input / output for accessing the disk. In a defective disk block replacement method in a switching system having a control device and a disk block replacement device that replaces a defective block of each disk device, a defective disk block replacement control between the maintenance operation device and the input / output control device If a defective disk block is accessed when writing data to one of the disk devices from the maintenance operation device, this defective disk block is immediately replaced and rewritten, and the defective disk block is accessed when reading. If it is done, the block of the same address of the disk device of the opposite system And writes the al read contents after substitute the bad disk blocks.

[0006]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a defective disk block replacement method of the present invention, and FIG. 2 is a flow chart for explaining the operation in FIG.

The maintenance operation device 1 accesses the 0-system and 1-system disk devices 3A and 3B through the input / output control device 2, and is provided with a terminal device 8 for inputting a command. The defective disk block replacement control device 4 is connected to the maintenance operation device 1 and the input / output control device 2, and the 0-system and 1-system disk devices 3A and 3B have a normal disk block area 6 and a replacement disk block area 7, respectively. Bad block replacement devices 5A and 5B are provided. The defective block replacement devices 5A and 5B replace the defective blocks in the normal block area 6 of the disk devices 3A and 3B.

Writing from the maintenance operation device 1 to the 0-system and 1-system disk devices 3A and 3B is performed for both systems, and the contents of the disk devices 3A and 3B of both systems are always the same. .. In addition, the disk device 3 by the maintenance operation device 1
Reading from A and 3B is performed from only one system.

Next, the operation of this embodiment will be described with reference to FIGS. Maintenance operation device 1 is a single system (for example, 0 system)
If a defective block occurs during writing to the disk device 3A, the defective block is detected (step 21), and the defective disk block replacement control device 4 performs the replacement process for that block via the defective block replacement device 5A ( After the defective block replacement is completed in step 22), rewriting is performed (step 26). The maintenance operation device 1 is a single system (for example, 1
If a defective block occurs during reading from the disk device 3B (system) (step 21), the defective disk block replacement control device 4 performs replacement processing for that block via the defective block replacement device 5B (step 2).
2) At this time, since the contents of the block after being replaced are not correct after replacement, the contents of the defective disk block replacement controller 4 from the same address of the normal disk block area 6 of the disk device 3A of the opposite system (0 system) Is read (steps 23 and 24), and then written to the block after replacement of the disk drive 3B of the 1st system where the defective disk block has occurred (step 25). Therefore, the contents after substitution are also correct.

[0010]

As described above, according to the present invention, the maintenance operation device is provided with the defective disk block replacement control device, and the defective disk block is immediately replaced even if a defective block occurs when the maintenance operation device accesses the disk device. Since the contents are correct, there is an effect that the disk device in which the defective block has occurred can be used as it is without being stopped.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a defective disk block replacement method according to the present invention.

FIG. 2 is a flowchart for explaining the operation in FIG.

FIG. 3 is a block diagram showing an example of a conventional defective disk block replacement method.

FIG. 4 is a flowchart for explaining the operation in FIG.

[Explanation of symbols]

 1 Maintenance operation device 2 Input / output control device 3A, 3B Disk device 4 Bad disk block replacement control device 5A, 5B Bad block replacement device 6 Normal disk block area 7 Replacement disk block area

Claims (1)

[Claims] 1. An external storage device of a maintenance operation device is set to 0.
Disk block replacement in a switching system having dual system 1 and 2 system disk devices, an input / output control device for accessing the disk, and a disk block replacement device that replaces the defective block of each disk device In the method, if a defective disk block alternative control device is provided between the maintenance operation device and the input / output control device, and a defective disk block is accessed during writing from the maintenance operation device to one of the disk devices, This defective disk block is immediately replaced and rewritten, and if the defective disk block is accessed during reading, the contents read from the block of the same address of the disk device of the opposite system are replaced after replacement of the defective disk block. Defective switching system characterized by writing I disk block alternative method.