JPH0198031A - Precheck system for on-line fault - Google Patents

Abstract

PURPOSE:To realize the highly efficient input/output to a file by setting a file state control table to control the fault state of the file and checking the state of the file before the actual input/output actions are started to the file. CONSTITUTION:In case it is regarded from the processing result of a fault state setting device 16 of a CPU 1 that a file 5J which has an error at the input/output time is kept under a fault state, a fault state display is set to the file state control information on the file 5J on a file state control table in a main memory 4. As a result, a fact that the file 5J has a fault is informed hereafter from a fault state informing device 13 via a communication device 12 even though the input/output requests are received from terminals 61-6N to the file 5J. Thus these terminals can know the fault state of the file 5J before they actually perform the input/output actions to the file 5J. Then the fault of the file 5J is recovered by a recovery processor 17.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an online fault pre-check method, and in particular, to a method for checking the fault status of a file that involves recovery processing in an online system before actually performing input/output to the file. Regarding the online fault pre-check method.

[Conventional technology]

The conventional method of checking for file failure in online systems is to determine that a file is in a failed state when an error occurs during actual input/output to the file.

Further, even if a read error occurred, the file in which the read error occurred was not considered to be in a failure state and was not subject to recovery processing.

[Problem that the invention seeks to solve]

In the above-mentioned method of checking for file failures in the conventional online system, it was only known that a file was in a failure state when an error occurred when input/output was actually performed on the file. The drawback is that it is not possible to check for file failures unless actual input/output is performed on the file.

In addition, even if read errors occur frequently, the files in which read errors occur are not considered to be in a failed state and are not subject to recovery processing, so it takes time to prevent file failures from being recovered and to prevent frequent read errors. There are drawbacks.

In view of the above points, it is an object of the present invention to make it possible to check the failure status of a file before actually inputting/outputting the file by setting a file status management table, and to prevent read errors from occurring a certain number of times. To provide an online fault pre-checking system capable of performing recovery processing on files whose read errors have occurred over a certain number of times, and enabling retry without regarding files in which read errors occur less than a certain number of times to be in a faulty state, thereby suppressing read errors.

[Means for solving problems]

The online fault pre-check method of the present invention includes an initial setting means that secures an area for creating a file state management table and initializes the file state management table, and a fault detection means that detects a file fault during actual input/output. , a failure status setting unit that determines a trigger for failure detection of the file whose failure has been detected by the failure detection unit and sets a failure status display in the file status management table;
a recovery processing means for restoring the file whose failure status indication is set in the file status management table by the failure status setting unit; and a recovery processing unit that restores the failure status indication of the file restored by the recovery processing unit into the file status management table. a fault condition disabling means for clearing from the
and a fault state notification means that refers to the file state management table and notifies the terminal of the fault state of the file to be input/output before starting input/output to the file.

[Effect]

In the online failure pre-check method of the present invention, the initial setting means secures an area for creating a file status management table and initializes the file status management table, and the failure detection means detects a file failure during actual input/output. ,
The failure status setting means determines the trigger of failure detection of the file in which the failure has been detected by the failure detection means and sets a failure status display in the file status management table, and the recovery processing means sets the failure status display in the file status management table by the failure status setting means. A file with a failure status indication set is restored, the failure status invalidation means clears the failure status indication of the restored file by the recovery processing means from the file status management table, and the failure status notification means starts human output for the file. Before doing so, refer to the file status management table and notify the terminal of the failure status of the file to be input/output.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an online system to which an online fault pre-check method according to an embodiment of the present invention is applied. This online system includes a central processing unit 1, a center console 2, a management database 3, a main memory 4, an external storage device 5, and a central processing unit 1.
and N (N is a positive integer) terminals 61 to 6N connected via communication lines.

The central processing unit 1 includes an initial setting means 11 and a communication means 12.
, a fault state notification means 13 , a fault detection means 14 , a read error counter 15 , a fault state setting means 16 ,
It includes a recovery processing means 17 and a failure state invalidation means 18.

The external storage device 115 stores M (M is a positive integer) files 51 to 5M.

Referring to FIG. 2, the process in the initial setting means 11 includes a file status management table area securing step 111.
, a file information acquisition step 112 , and a file information setting step 113 .

Referring to FIG. 3, the process in the failure status notification means 13 includes the file status management table reference step 131.
and a message notification step 132.

Referring to FIG. 4, the processing in the failure detection means 14 includes a file failure detection step 141, a read error determination step 142, a read error counter value increase step 143, and a failure status setting means activation step 14.
Consists of 4.

Referring to FIG. 5, the processes in the failure status setting means 16 include a failure detection trigger determination step 161, an open error display setting step 162, a failure status display setting step 163, and a file failure detection notification step 164.
and a read error counter value determination step 165.
and a read error counter value clearing step 166.

Referring to FIG. 6, the processing in the recovery processing means 17 includes a pre-recovery preparation step 171, a file restoration step 172, and a failure state invalidating means activation step 17.
It consists of 3.

Referring to FIG. 7, the processing in the failure state invalidating means 18 consists of a recovery processing result confirmation step 181 and a failure state display clearing step 182.

Next, the operation of the online fault pre-check system of this embodiment configured as described above will be explained.

First, the initial setting means 11 is activated by the center console 2.

The activated initial setting means 11 first secures an area on the main memory 4 in which the file status management table is stored (step 111). Next, the initial setting means 11 obtains file information including the storage location of each file 51-5M for each file 51-5M from the management database 3 that manages the files 51-5M stored in the external storage device 5. (Step 112 ”), each file 51 is stored in the file type M management table area secured on the main memory 4.
The file status management table is initialized by setting the file information of ~5M and initializing the file status management information (step 113). At this time, in each file status management information in the file status management table, a reference value for the number of read error occurrences is set in advance to determine how many times read errors must occur before the file is considered to be in a failed state. put.

When there is an input/output request from any terminal 6K among the terminals 61 to 6N to any file 5J among the files 51 to 5M stored in the external storage device 5, the communication means 12 of the central processing unit 1 first , activates the failure state notification means 13.

The activated failure status notification means 13 refers to the file status management table on the main memory 4 and checks whether a failure status indication is set in the file status management information of the file 5J for which the input/output request has been made (step 131). Next, the failure state notification means 13, via the communication means 12,
If failure status display is set in the file status management information of file 5J, a message to that effect is sent, and if failure status display is not set, a message to that effect is sent to terminal 6K.
(step 132).

When the terminal 6 is notified by the communication means 12 that the file 5J is not in a failure state, the file 5J is sent to the terminal 6 via the communication means 12.
Start input/output to J.

If an error occurs during input/output with file 5J,
The failure detection means 14 detects a failure in the file 5J (step 141'). If the failure in the file 5J is detected, the failure detection means 14 determines whether or not the trigger for detecting the failure in the file 5J is a read error. (step 142). If there is a read error, the failure detection means 14 increments the value of the read error counter 15 of the file 5J by one (step 143), and if it is not a read error, it does nothing and activates the failure state setting means 16. (Step 144).

Failure state setting means 1 activated by failure detection means 14
6 is the file 5 detected by the failure detection means 14
Determine whether the trigger for failure detection in J is an open error, write error, or read error (step 161).
.

If it is determined in step 161 that there is an open error,
The failure state setting means 16 sets an oven error display in the file state management information axis of the file 5J in the file state management table on the main memory 4 (step 16).
2) Set the fault status display step 163);
The center console 2 is notified that the file 5J is in a failure state (step 164).

If it is determined in step 161 that a write error has occurred, the failure state setting means 16 performs the processing of steps 163 and 164, that is, the file 5J in which the write error has occurred is unconditionally regarded as being in a failure state.

If it is determined in step 162 that a read error has occurred, the failure state setting means 16 sets the standard for the number of read error occurrences that has been preset in the file status management information of the file 5J in the file status management table on the main memory 4. The value of the read error counter 15 is compared with the value of the read error counter 15 to determine whether the value of the read error counter 15 exceeds the reference value (step 165). If it is determined that the fault state setting means 16 is present, the fault state setting means 16 clears the value of the read error counter 15 to 0 (step 166), and performs the processing of steps 163 and 164. If it is determined that the problem is not exceeded, the fault state setting means 16 performs step 1.
63 and steps 164 are skipped.

In other words, the file 5J is not considered to be in a failed state.

As a result of the processing by the fault state setting means 16, if the file 5J in which an error occurred during input/output is deemed to be in a fault state, the file state management information of the file 5J in the file state management table on the main memory 4 is marked with the fault state. The display is set. As a result, even if there is an input/output request for the file 5J from the terminals 61 to 6N thereafter, the failure state notification means 13 notifies the file 5J through the communication means 12 that the file 5J is in the failure state. 6N
can know that the file 5J is in a failure state before actually performing input/output to the file 5J.

On the other hand, the operator of the center console 2 who has been notified by the failure state setting means 16 that the file 5J is in a failure state starts the recovery processing means 17 via the center console 2 as necessary.

The activated recovery processing means 17 refers to the file status management table on the main memory 4 and prepares the failed file 5J to a recovery-enabled state (step 171), and activates a recovery program (not shown). to restore file 5J (step 172)
, when the restoration of the file 5J is completed, the recovery processing means 17 activates the failure state invalidation means 18 (step 173).

The failure state invalidating means 18 activated by the recovery processing means 17 confirms that the recovery processing for the file 5J has been successfully performed (step 181), and changes the file state of the file 5J in the file state management table on the main memory 4. The fault status display in the management information is cleared (step 182).

〔Effect of the invention〕

As explained above, the present invention manages the failure status of a file by setting a file status management table, so that the status of the file can be checked before actually starting input/output to the file. This has the effect of allowing efficient input/output.

In addition, by setting a reference value for the number of read error occurrences in advance to consider a file in which a read error has occurred as a failure state, it is not considered to be in a failure state until the actual number of read error occurrences exceeds the reference value, and the reference value is set. By performing recovery processing when the standard value is exceeded, it is possible to perform retries on the file where the read error occurred until the standard value is exceeded, and the file that exceeds the standard value is restored and the read error is prevented. It has the effect of preventing frequent occurrences.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing the configuration of an online system to which an online fault pre-check method according to an embodiment of the present invention is applied, and FIG. 2 is a process performed by the initial setting means in FIG. 1. FIG. 3 is a flowchart showing the processing in the failure state notification means in FIG. 1, FIG. 4 is a flowchart showing the processing in the failure detection means in FIG. 1, and FIG. FIG. 6 is a flowchart showing the processing in the failure state setting means; FIG. 6 is a flowchart showing the processing in the recovery processing means in FIG. 1; FIG. 7 is a flowchart showing the processing in the failure state invalidating means during the first review. In the figure, 1... Central processing unit, 2... Center console, 3... Management database, 4... Main memory, 5... External storage device, 11... Initial setting means, 12. ...Communication means, 13...Failure status notification means, 14...Failure detection means, 15...Read error counter, 16...Failure state setting means, 17...Recovery processing means, 18... - Failure state invalidating means, 51-5M...file, 61-6N...terminal.

Claims (1)

[Claims] Initial setting means for initializing the file state management table by securing an area for creating the file state management table; fault detection means for detecting a file fault during actual input/output; and this fault detection. a failure status setting means for determining the trigger of failure detection of the file in which a failure has been detected by the means and setting a failure status indication in the file status management table; recovery processing means for restoring the file whose display has been set; fault state invalidating means for clearing the fault state display of the file restored by the recovery processing means from the file state management table; An online fault pre-check method comprising: fault state notification means that refers to the file state management table and notifies a terminal of the fault state of a file to be input/output before starting.