JPH03136148A - File recall system - Google Patents

Abstract

PURPOSE:To prevent the delay of the start of a job due to recall processing by automatically selecting the time, when the load on a computer system is light, to reserve the recall processing before the use of a file. CONSTITUTION:In a bank application, a user selects the time, when the load on the computer is light, to reserve the execution of recall processing in accordance with the time of the use of the file by a planned recall means 5. A planned recall managing means 6 monitors the load on the system; and when the load on the system is lighter than a preliminarily designated value, the means 6 refers to a planned recall management file 7 to select the file, which should be first used, and reports it to a file recall means 3. The file recall means 3 detects the volume, to which the objective file should be migrated, to recall a file storage volume 4 from a migration file storage volume 2. Thus, the execution of the job is not delayed for a long time.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a computer file system.

The present invention relates to a file migration/recall method for improving the utilization efficiency of space in an external storage device for storing data, and in particular to improving the efficiency of recall processing for files that are used in a planned manner.

[Prior Art] Conventionally, as a method for recalling data from a low-speed, large-capacity external storage device to a high-speed device, there is a method in which the recall is performed during file resource allocation processing or file open processing.

For example, when executing a patch job, 1 instructs the job control language etc. to allocate a file resource to be used in that job, but 1 calls the recall process when it learns that the resource to be allocated has been magnified. The resource allocation process is delayed until the data in the file is completely recalled to the high-speed external storage device.

As a system that adopts such a recall method, AD in PACOM O8IV/P4 MSP
F function (FACOM O8IV/P4 MSP ADP
There is an operational manual).

[Problems to be Solved by the Invention] In the case of the conventional recall method described above, the resource allocation process is temporarily suspended, the recall process is called, and the resource allocation process is performed only after the recall process is completely completed. There are the following problems.

■Since recall processing is performed at the time a file is used, the start of job execution may have to wait for a long time, especially when recalling a large file.

■Since the volume from which the file will be recalled is determined for the first time when the file is used, there may be insufficient space on the volume to which the file is recalled, and the job may not be able to be executed.

An object of the present invention is to provide a recall method that does not delay the start of job execution.

Another object of the present invention is to provide a recall method that prevents a situation in which a job cannot be executed.

[Means for Solving the Problems] According to the present invention, when access to a file is stopped, the file is migrated to a large-capacity first external storage device, and access is requested to start again. and,
In a file system to be recalled to a second external storage device, a recall management file is created in which at least the date and time at which the file is to be used is registered in advance, and system load monitoring is performed, and when the system load is low, a planned recall management file is created. A planned recall management means for determining a file to be recalled by referring to the file, and determining a migration destination volume name of a migrated file, and a recall file determination from said 8-1 systematic recall management means. the file recall means for recalling the file upon receiving the notification, and the file is recalled to the second external storage device in advance before file access is resumed. A recall method is obtained.

[Example] Next, one embodiment of the present invention will be explained with reference to examples.

1, in the recall method according to the present invention, when a file existing in file storage volume 4 is migrated to migration file storage volume 2, the migrated file is A migration management file 1 that manages whether the file exists in a location, a file recall means 3 that recalls a file from a migration destination volume when a recall is requested according to the migration management file 1, and a file recall means 3 that is used in a planned manner. A planned recall specifying means 5 for specifying the file name of the file to be used, the date and time to be used, or system load conditions for starting the recall, a planned recall management file 7 for storing the specified conditions, and a system load. A recall management means 6 is provided which selects a file that meets one condition from the planned recall management file 7 while monitoring.

In a business system, there are files that are constantly accessed, such as database files.

There are files that are used only at certain times.

For example, in one banking business, there are files that have fixed usage times, such as processing at the end of January and beginning of January, or processing at the end of the term. Such files are automatically migrated after a certain period of time when access ends, but you can predict in advance when they will be used again. The user uses the planned recall means 5 to reserve the execution of the recall process by selecting a time when the load on the computer is light, in accordance with the time when the file will be used, and before access is started. The planned recall management means 6 determines the files to be recalled while monitoring the system load. When the system load becomes less than a predetermined value, the planned recall management file 7 is referred to and the file whose use time is the closest is selected. is selected and notified to the file recall means 3. The file recall means 3 knows the volume to which the target file has been migrated and recalls the file storage volume from the migration file storage volume. In the process of recalling a file, if the file is to be used in a planned manner, a time when the load on the computer system is low is automatically selected before the time when the file is used. This has the effect of avoiding situations where a job cannot be executed due to a delay in job start time or a lack of space.

Graysion file storage volume, 3...File recall means 14...File storage volume.

5... Planned recall designation means, 6... Planned recall management means, 7... Planned recall management file.

[Brief explanation of the drawing]

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

Claims (1)

[Claims] 1. A file system that migrates a file to a first large-capacity external storage device when access to the file is stopped, and recalls it to a second external storage device when access is requested to start again. A recall management file is created in which at least the date and time of use of the file is registered in advance, and system load monitoring is performed,
a planned recall management means for determining a file to be recalled by referring to a planned recall management file when the system load is low, and determining a volume name to which the migrated file is to be migrated; and a recall means for recalling the file upon receiving a notification of recall file determination from the planned recall management means, and recalling the file to the second external storage device in advance before file access is resumed. This is an r file recall method that is characterized by the following.