JPH0944317A - Registering system for alternate sector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dynamically perform the alternate sector processing of duplexed magnetic disks. SOLUTION: This system is equipped with an error sector check means 500 which detects an I/O error when data read/write on a magnetic disk device is performed, an error sector managing table 200 which stores detected error information, an alternate sector generating means 600 which generates the alternate sector of an error sector based on the error information stored in the error sector managing table 200, an input/output means 700 which writes the alternate sector generated by the alternate sector generating means 600 on the magnetic disk devices 300, 400, and an alternate sector I/O means 800. Also, the error sector managing table 200 stores the device number of the magnetic disk device in which an error occurs and the error information to manage the sector number and sector state of the device. In this way, it is possible to shorten release time when the I/O error occurs, and also, to improve reliability for the system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of registering an alternative sector of a magnetic disk system in an information processing apparatus, and more particularly to a fixed length block method disk duplication processing.

[0002]

2. Description of the Related Art In a conventional disk duplication processing method, an I / O failure during writing or reading (hereinafter referred to as I / O
Error), the error disk was separated from the duplication system, and the alternative sector processing of the error sector was performed as a single magnetic disk device.

As another method, for example, as disclosed in Japanese Patent Laid-Open No. 4-155673, in the case of a mirrored disk, a write or read I / O is performed.
At the time of error, alternative sector processing and data restoration processing were performed on the extension of the corresponding I / O.

[0004]

As described above, in the conventional disk duplication processing, since human intervention is required for the disk restoration processing when an I / O error occurs, it takes time to restore the data, During this period, the duplex operation state cannot be continued, so that there is a drawback that the reliability of the system is reduced. Further, in the case of a mirrored disk, there is a problem that the processing is delayed because the alternative sector processing is performed when an I / O error occurs.

[0005]

In order to solve the above-mentioned problems, the present invention provides an information processing system having a duplicated magnetic disk device in which an I / O error occurs when data is written in or read from the magnetic disk device. An error sector management table that stores the error information when the error sector occurs, and an alternative sector creation unit that creates an alternative sector of the error sector of the magnetic disk device based on the error information stored in the error sector management table, It is characterized by comprising a duplication writing means for writing the created alternative sector in the magnetic disk device. Further, the error sector management table has error information for managing the device number of the magnetic disk device in which the error has occurred, the sector number in the device, and the sector state.

[0006]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment for realizing the alternative sector registration method of the present invention. Also,
FIG. 2 is a diagram showing the configuration of the alternative sector registration system of the present invention, and FIG. 2A shows the main configuration of an information processing system having a duplicated magnetic disk device.
(B) shows the structure of the error sector management table.

First, referring to FIG. 1, according to the alternative sector registration method of the present invention, an error sector management table 200 for managing I / O error detection at the time of writing or reading to a magnetic disk device, and a duplicated primary system. Magnetic disk device 300 and secondary magnetic disk device 400
It includes an error sector check means 500, an alternative sector creation means 600 for performing an alternative sector process of an error sector based on the data of the error sector management table 200, and an input / output means 700, which are instructed by a program. Controlled.

Next, referring to FIGS. 2A and 2B, the main storage device 100, the error sector management table 200, the primary magnetic disk device 300, and the secondary magnetic disk device 400 will be described. Contains. Then, the main storage device 100 internally stores data 101 that is read or written data, and the error sector management table 200 stores the device number 201 and the sector number 20.
2, including sector state 203 and alternate sector 204,
Further, the primary magnetic disk device 300 stores the primary sector 301 written to or read from the primary system, and the secondary magnetic disk device 400 stores the secondary sector 401 written to or read from the secondary system. Also, a sub system alternative sector 402 which is a sub sector of the sub system sector 401 is stored.

Next, the flow of the alternative sector registration method (duplication control processing) of the present invention will be described.

FIG. 3 is a flow chart showing the flow of processing at the time of an I / O error in the present invention, and FIG. 4 is a flow chart showing the flow of processing at the time of executing I / O in the present invention.

Referring to FIG. 3, first, for the data 101 on the main storage device 100, if the read I / O to the magnetic disk device is issued, it is issued to one side and the write I / O is issued.
If so, it is issued to both systems (step 501). When an I / O error occurs in any of the systems (step 5)
02), the device number 201, the sector number 202, and the sector state 203 of the magnetic disk device in which the error has occurred are registered in the error sector management table 200 (step 5).
03). Then, the alternative sector creation process is activated (step 504), and the I / O process is terminated.

The alternative sector creation process is started when the above-mentioned I / O error occurs, performs the alternative sector process of the sector in which the I / O error has occurred (step 601), and writes the I / O to the corresponding sector to the write I / O enabled state. (Step 602).

Next, referring to FIG. 4, when an I / O request is issued again to the relevant sector, the corresponding I / O is issued.
Is the read system I / O (step 801), the I / O is issued to the opposite system in which no error has occurred (step 80).
2) Obtain correct data. Then, the write operation is performed to the alternative sector for the sector in which the error has occurred (step 803). Then, the error status management table 200 is updated, the status is changed to a read / write enabled status (step 804), and the processing is terminated. If it is write I / O in step 801,
Perform I / O as usual.

Next, the alternative sector processing on the sub system side due to an I / O error to the sub system side will be described in detail as an example.

First, the data 101 on the main memory 100
If a read I / O is issued from the sector 401 on the disk 400 of one side of the disk, that is, the disk 400 of the sub system, and this read I / O results in an I / O error due to a failure such as a sector defect, step 502. In step 503, the error state is determined and the error sector management table 200
Device number 201 and sector number 20 in which an error occurred
2. Data indicating the sector state 203 in which an error has occurred is stored, and read / write for the sector is prohibited. Then, in step 504, the alternative sector creation process is activated.

In the alternative sector creation process started in step 504, an alternative sector is created in step 601, the alternative sector number is registered in the alternative sector number 204 in the error sector management table 200, and step 60 is executed.
At 2, the write I / O is changed to the permission state.

After that, when a write operation is issued to the relevant sector, I / O is issued to both systems as usual. When a read operation is issued, step 80
At 2, the corresponding data is read from the opposite system. Next, the data 101 read in step 802 is transferred to step 8
Write with 03. Then, in step 804, the sector status 203 in the error sector management table 200 is read.
Update to a state in which writing is possible.

In this embodiment, the alternative sector processing on the sub system side due to an I / O error to the sub system side has been described as an example. However, in terms of processing, both the main system and the sub system are equivalent and Similar processing is performed even when an I / O error occurs in the system. Also,
The error sector management table 200 manages the state of the error sector during the processing, and becomes the management table of the sector using the alternative sector after the alternative sector processing is completed.

[0020]

As described above, according to the present invention, it becomes possible to execute the alternative sector processing for the duplicated magnetic disk device without manual intervention, and the recovery processing of the failed disk device can be performed quickly. be able to. Further, as compared with the case of the mirrored disk, there is an effect that the delay of the processing for creating the alternative sector can be significantly reduced.

Furthermore, by periodically referring to the error sector management table, the number of error sectors for each magnetic disk device can be obtained and used as information for determining the magnetic disk device requiring preventive maintenance. There is.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment for realizing the present invention.

FIG. 2 is a diagram showing a configuration of a main part in an alternative sector registration method of the present invention.

FIG. 3 is a flowchart showing a flow of processing when an I / O error occurs in the present invention.

FIG. 4 is a flowchart showing a flow of processing at the time of executing I / O in the present invention.

[Explanation of symbols]

 100 Main Storage Device 101 Data 200 Error Sector Management Table 201 Device Number 202 Sector Number 203 Sector Status 204 Alternate Sector Number 300 Primary Magnetic Disk Unit 301 Primary Sector 400 Secondary Magnetic Disk Unit 401 Secondary Sector 402 Secondary Alternate Sector 500 Error sector check means 600 Alternative sector creation means 700 Input / output means 800 Alternative sector I / O means

Claims (2)

[Claims] 1. An information processing system having a duplicated magnetic disk device, and an error sector management table for storing error information when an I / O error occurs when writing or reading data in the magnetic disk device, Alternative sector creating means for creating an alternative sector of the error sector of the magnetic disk device based on the error information stored in the error sector management table, and dual writing means for writing the created alternative sector in the magnetic disk device. A method of registering an alternative sector, characterized by having: 2. The error sector management table comprises error information for managing a device number of a magnetic disk device in which an error has occurred, a sector number in the device, and a sector state. Alternative sector registration method.