JPH04120635A - System for controlling opening of file - Google Patents

Abstract

PURPOSE:To shorten a restarting process by every on-line system or batch job by opening an information saving file on the basis of catalogue information and volume information. CONSTITUTION:Open information is stored in an open information saving file 80 after a blocking process so as to reduce the number of I/O operations required for making system starting/restarting processes. While a system is in an on-line state, in addition, the number of I/O operations to catalogue information 50 and volume information 60 and 61 required at file opening time can be reduced at the time of performing the next system starting/restarting process even when closing or opening of files 30-33 is generated by always checking the open information already saved to the file 80 and new open information and saving the open information to be used to the file 80. Therefore, the file opening time is reduced during the system starting/restarting process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a file open control method for an online system that accesses a plurality of files.

[Conventional technology]

In the conventional online system, rVO53/ES
As stated in ``Center Management - JSS 3 Edition - 8091-3-008 (Hitachi, Ltd.)'', a quick system restart method was adopted to shorten the time required to restart the system after a system failure occurred.

The quick system restart method saves the main storage contents of the entire system, including the operating system, to a file during online system startup processing, and when a system failure occurs, the IPL and online system startup processing are saved. The system is then restarted in a short time by restoring the contents of the main storage device from the evacuated files.

[Problem to be solved by the invention]

When restarting an online system using the quick system restart method, the main storage contents of the entire system, including the operating system, are saved to a file. It is targeted. For this reason, if multiple online systems or patch jobs are running on one host computer,
For example, when a failure occurs in one online system, the entire system including other online systems and patch jobs must be stopped and restarted. could not be applied and the system restart processing time could not be reduced.

An object of the present invention is to provide a system in which a plurality of online systems or patch jobs are running within one host computer, and when a failure occurs in one online system, for example, when a failure occurs in one online system, it is possible to An object of the present invention is to provide a file open control method that allows restart processing to be executed for each online system or patch job in a short time without affecting jobs.

[Means to solve the problem]

In order to achieve the above object, the file open control method of the present invention provides an online system that accesses at least one file existing on at least one volume. an open information table on a main storage device that stores file catalog information indicating a volume in which the file exists and volume information indicating position information on the volume of the file; and the catalog information stored in the open information table. and an open information save file on an external storage device for saving the volume information,
At the time of restart processing, the open information save file is read, the catalog information and the volume information are read into the open information table on the main storage device, and the file is written based on the read catalog information and volume information. It is to be opened.

[Effect]

Even when multiple online systems or patch jobs are running on one host computer, the catalog information and volume information on disk volumes can be updated by starting/restarting the online system without affecting other online systems or patch jobs. Files can be opened without reading them, reducing system start/restart time.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

FIG. 1 shows an example in which an online system 20.21 and a patch job 22 are running on a host computer 10.

In the example shown in FIG. 1, the online system 2
Among the files accessed by 0, file 30.31 exists on disk volume 40, and file 32.33 exists on disk volume 40.
exists in disk volume 41.

The catalog information 50 is information indicating the attributes of the files 30 to 33 and in which disk volume the files 30 to 33 exist. In the example shown in FIG. 1, the catalog information 50 exists in the disk volume 40.

Volume information 60 and 61 exists for each disk volume 40.41, and each disk volume 40.41 has volume information 60 and 61.
File 30゜31 and file 3 existing in 41
This information indicates the position on the disk volumes 40 and 41 of Nos. 2 and 33.

Catalog information 50 and volume information 60, 61, that is, open information for files 30 to 33, are both information necessary to open files 30 to 33, and when a file is opened, it is stored in the open information table 70 on the main storage device. Stored.

The open information save file 80 contains the catalog information 50 and volume information 6 stored in the open information table 70.
This is a file in which 0 and 61 are saved.

Figure 2 shows the volume information 60.6 of files 30 to 33 when starting up an online system for the first time.
1 and catalog information 50, that is, files 30 to 3
3 (hereinafter, volume information 60.61 and catalog information 50 are collectively referred to as open information) to the open information save file 80, or if open information was not saved to the open information save file 80 in the past. 12 is a flowchart for explaining the operation of online system start/restart processing when saving open information to an open information save file 8o when starting up an online system that was started in 2008 again. Here, the starting process of the online system 20 in FIG. 1 will be explained as an example.

When the online system 20 is started, it first performs initial setting processing (step 1001). In this initial setting,
Loads processing programs, imports various definition information and execution parameters, creates control tables on the main memory, etc.

Next, files 30 to be used in the online system 20
33 is opened (step 1002). When files 30 to 33 are opened, the catalog information 50 and volume information 60, 61 corresponding to the opened files 30 to 33 are read and stored in the open information table 70 on the main storage device.

Next, the open information of files 30 to 33 stored in the open information table 70 in step 1002 is saved to the open information save file 80 (step 1003
).

After this, it is determined whether the online system 20 currently being executed is launched for the first time, or whether it was launched in the past without saving open information to the open information save file 80; That is, it is determined whether the process is a system start process or a system restart process (step 1004).

In the case of system start processing, transaction processing is performed (step 1006). Further, in the case of system restart processing, recovery processing of transactions and files 30 to 33 is performed (step 10o5), and then transaction processing is performed (step 1006).

FIG. 3 shows how the online system 20 starts when the online system 20, which has been started with the open information saved in the open information save file 80, terminates normally or abnormally, as shown in FIG. This shows the operation of restart processing.

The online system 20 first performs initial setting processing (
Step 2001).

Next, the open information save file 80 is read to recover the contents of the open information table 70 on the main storage device (step 2002).

Then, files 30 to 33 are opened based on the recovered open information table 70 (step 2.00).
3).

After this, it is determined whether the online system 20 currently being executed has previously terminated normally or terminated abnormally, that is, whether it is system start processing or system restart processing. (Step 2004).

In the case of system start processing, transaction processing is performed (step 2006). For system restart processing,
Recovery processing for transactions and files 30 to 33 is performed (step 2005), and then transaction processing is performed (step 2006).

Catalog information 50 and volume information 60.61 are scattered across multiple disk volumes 40.41. On the other hand, open information can be stored in the open information save file 80 through blocking processing. Therefore,
Files 30 to 33 in conventional system start/restart processing
The 170 times that occur in system start/restart processing using the open information save file 80 is extremely small compared to the 110 times that occur when opening the catalog information 50 and volume information 6o, 61.

As shown in FIG. 2, after creating the open information table 70 in the system start/restart process and writing its contents to the open information save file 80, or after reading and comparing the contents from the open information save file 80. When files 30 to 33 are closed and opened and new file open information is created, catalog information 5
o and volume information 60.61 may become inconsistent with the saved open information. To deal with this, if the system is online, whenever a new file is opened, it checks the open information that has already been saved and the new open information, and saves the open information to be used in the open information save file 80. evacuate. As a result, even if files 30 to 33 are closed or opened while online, the next system start/restart process will not use inconsistent open information and will occur when the files 30 to 33 are opened. It is possible to eliminate 170 times of accessing the catalog information 50 and volume information 60, 61.

In this embodiment, the relationship between files 30 to 33 and disk volumes 40 and 41 is that multiple files exist in one disk volume (files 30 and 31 exist in disk volume 40, and Files 32 and 33 exist in volume 41)
Although related, the present invention can also be applied to an online system in which one file is configured from a plurality of disk volumes and a plurality of files configured in this manner exist.

〔Effect of the invention〕

As described above, according to one aspect of the present invention, the file open time in system start/restart processing can be significantly shortened, so that the effect of enabling high-speed system start/restart can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a computer system in an embodiment of the present invention, and FIG. 2 shows the start of the online system when the online system is started by saving file open information to an open information save file. /A flowchart showing the restart process, FIG. 3 is as follows:
12 is a flowchart illustrating an online system start/restart process when an online system that was launched by saving open information in an open information save file in the past ends normally or abnormally. 10...Host computer, 20.21...Online system, 22...
...Patch job, 30.31,32.33...File, 40.
41... Disk volume, 50...
・Catalog information, 60.61...Volume information, 7o...
- Open information table, 80... Open information save file. Figure 1 Figure 2

Claims (1)

[Claims] 1. An online system that accesses at least one file existing on at least one volume, comprising means for opening the file, and a file indicating attributes of the file and the volume in which the file exists. an open information table on a main storage device that stores catalog information of the file and volume information indicating location information on the volume of the file; and an external storage that saves the catalog information and volume information stored in the open information table. an open information save file on the device, read the open information save file during start/restart processing of the online system, read the catalog information and the volume information into the open information table on the main storage device, A file open control method characterized in that the file is opened based on the read catalog information and volume information.