JPH06124169A - Duplex systematized optical disk device and automatic i/o error restoring method - Google Patents

Abstract

PURPOSE:To obtain a system whose reliability is high by duplexing an optical disk housed in an autochanger, and using an automatic I/O error restoring method. CONSTITUTION:A computer 10 controls two controllers 20 and 22, and performs an access to the optical disks housed in autochangers 30 and 32 by using drives 40 and 42. The computer 10 simultaneously issues an I/O instruction to the two controllers 20 and 22. That is, the computer 10 operates an I/O processing to the optical disks housed in the autochangers 30 and 32 while allowing the controllers 20 and 22 to synchronize with each other. Thus, the system whose reliability is high can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-capacity duplication system in which reliability is improved by duplicating an optical disc stored in an autochanger, and in particular, one of the duplicated optical discs causes an I / O error. The present invention relates to an I / O error automatic recovery method in the case of performing.

[0002]

2. Description of the Related Art Conventionally, an autochanger is connected to a host computer and is used to store a large amount of data such as image data. When an I / O error or other failure occurs on the optical disk, the autochanger is used for the optical disk. There was a problem that the stored data could not be restored.

Therefore, the system administrator backs up the optical disk in advance, detects the I / O error, and
The I / O error-caused optical disk stored in the autochanger was replaced with a new optical disk for recovery work.

[0004]

In the conventional system,
I / O on the optical disk stored in the autochanger
When a failure such as an O error occurs, the data stored in the optical disc cannot be restored, and thus there is a problem that backup work and restoration work of the optical disc are always performed.

On the other hand, it is conceivable to duplicate the optical disk stored in the autochanger so that manual backup work and restoration work can be avoided.

However, when an I / O error occurs in either one of the duplicated optical disks, the system administrator detects the I / O error and the I / O error stored in the autochanger occurs. In order to replace the optical disk with a new optical disk and perform recovery work, only the optical disk in which no I / O error has occurred is operated while the system administrator does not detect the I / O error. There was a problem that reliability depended on the system administrator.

The present invention has been made in order to solve the above-mentioned conventional problems. By duplicating the optical disk stored in the autochanger and further utilizing the I / O error automatic recovery method, the reliability is further improved. An object is to provide a high-duplex optical disc system.

[0008]

According to the present invention, in a computer system in which an arbitrary number of autochangers are connected, an optical disk stored in the autochanger is provided with a duplication system, and the I / O error of the duplication system is automatically set. In the recovery method, a procedure for storing an arbitrary number of unused spare optical disks in each autochanger, and I / O to either one of the duplicated optical disk for the primary file and the optical disk for the secondary file By the procedure of monitoring whether an error has occurred, and when the I / O error occurs, it is detected and the optical disk in which the I / O error has occurred and the spare optical disk are replaced.
The object is achieved by having a procedure for recovering the contents of a file while operating the system and a procedure for automatically notifying the system that an I / O error has been restored.

[0009]

According to the present invention, a mechanism for simultaneously performing I / O (writing / reading) processing on each of the optical disks stored in at least two autochangers in a host computer to which a plurality of autoengers are connected. By adding, it is possible to realize a large capacity duplex system using an autochanger.

Further, in the I / O error automatic recovery method in the duplicated system, an optional number of spare optical discs that are not used at all are stored in the respective autoengers, and the duplicated optical disc for the primary file and the duplicated disc I / O on either one of the file optical disks
O Whether or not an error has occurred is monitored and the I / O
When an error occurs, it detects it and replaces the optical disk in which the I / O error has occurred with the spare optical disk to restore the file contents while operating the system and automatically detect the I / O error. Since the system is notified that the data has been restored, in the case of a redundant system that has the role of a file server that is operated unattended for a long time, the system administrator can generate an I / O error on one optical disk of the duplicate Before operating the system, the recovery operation of the duplicated optical disc is automatically performed while operating the system, so the reliability of the system does not depend on the system administrator, and a more reliable duplicated optical disc system is provided. can do.

[0011]

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

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

In FIG. 1, two controllers 20 and 22 are connected to a computer 10, and autochangers 30 and 32 are connected to the respective controllers. The computer 10 has two controllers 20.
By controlling 22 and 22, the optical discs stored in the autochangers 30 and 32 can be accessed using the drive 40 for the autochanger 30 and the drive 42 for the autochanger 32.

The computer 10 issues I / O commands to the two controllers 20 and 22 at the same time. That is, the computer 10 synchronizes the controllers 20 and 22 with each other, and the auto changer 3
I at the same time for the optical disks stored in 0 and 32
/ O processing is performed.

For example, slot 7-1 and slot 8-1
I / O processing is simultaneously performed on the pair of optical disks 5-1 stored in the disk to duplicate them. Other numbers 5-
By performing the same processing for the optical disks 2, ..., 5- (N-1), and 5-N, a highly reliable, large-capacity duplex system is realized.

The duplication system includes a duplication optical disc 5
-1 to form the duplicated optical disc 5-N, and the autochangers 30 and 32 are the spare optical discs 6 respectively.
-1, 6-2 are provided, and I
It has the function of always monitoring by software whether an / O error has occurred.

Here, consider a case where the reading process is performed on the duplicated optical disk 5-1.

Of the two optical disks of the duplicated optical disk 5-1, the optical disk stored in the slot 7-1 is inserted into the drive 40, and the optical disk stored in the slot 8-1 is inserted into the drive 42. Read processing is performed. At this time, the slots 7-1 and 8-1 in which the two optical disks of the duplicated optical disk 5-1 have been inserted become empty.

Here, consider a case where an I / O error occurs in either one of the duplicated optical disks 5-1 such as the optical disk inserted in the drive 40.

FIG. 2 is a flowchart showing the automatic I / O error recovery method.

When an I / O error occurs on the optical disk,
The program controlling the duplexed optical disk writes logging information to a file. In step 100 of FIG.
Software (for example, a UNIX system daemon) that monitors whether or not an I / O error has occurred in the duplicated optical disk at regular intervals analyzes the information logged in the file and writes it to the drive 40. When it is detected in step 102 that an I / O error has occurred in the inserted optical disk, the optical disk in the drive 40 in which the I / O error has occurred is moved to the original slot 7-1 in step 104. , Step 10
At step 6, the spare optical disk 6-1 is inserted into the drive 40.
In step 108, the optical disk in which the I / O error has occurred is moved from the slot 7-1 to the slot 9-1 in which the spare optical disk 6-1 was stored, and step 110
Then, the duplicated optical disk 5-1 is restored.

The data is restored by locking the unaccessed blocks of the optical disk inserted in the drive 42 and having no I / O error, and
Copy to the spare optical disc newly inserted in 0,
Release the lock after copying the data. At this time, the block being accessed is kept waiting until the access is completed. The copy process is performed sequentially from the block with the smallest block number.

The block restored once is subjected to the duplication processing again. After the duplicated optical disk 5-1 is restored,
In step 112, a message is displayed on the system console at regular time intervals to notify the system that an I / O error has occurred.

By the above processing, the I / O error of the duplicated optical disk is automatically recovered even if there is no system administrator.

[0025]

As described above, according to the present invention, the optical disc stored in the autochanger is duplicated,
Further, by utilizing the I / O error automatic recovery method, there is an effect that a more reliable dual optical disk system can be provided.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an I / O error automatic recovery method.

[Explanation of symbols]

 10 ... Computer 20, 22 ... Controller 30, 32 ... Auto changer 40, 42 ... Drive 5-1, 5-2, ..., 5-N ... Duplicated optical disk 6-1, 6-2 ... Spare optical disk 7-1, 8-1, 9-1 ... Slot

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location G11B 20/18 U 9074-5D

Claims (2)

[Claims] 1. A computer system in which a plurality of autochangers are connected, wherein a mechanism for simultaneously performing I / O processing is added to the optical discs stored in at least two autochangers, and the optical discs are duplicated. An optical disk device that is a heavy system. 2. An I / O error automatic recovery method for an optical disk device having a duplicated system with respect to an optical disk stored in an autochanger, in which a desired number of spare optical disks that are unused are stored in each autochanger. And a procedure for monitoring whether or not an I / O error has occurred in either one of the duplicated primary file optical disk and secondary file optical disk, and when the I / O error occurs, Detect it, I /
The procedure to restore the contents of the file while operating the system by replacing the optical disk in which the O error occurred and the spare optical disk, and the procedure to automatically notify the system that the I / O error has been restored are provided. An I / O error automatic recovery method for an optical disk device, which comprises: