JPH03220621A - Disk input/output control system - Google Patents

Abstract

PURPOSE:To reduce the number of times of the input/output of a disk device by forming a file control table and an input/output buffer on a non-volatile memory backed up with a backup power source. CONSTITUTION:A file control table 6 and an input/output buffer 7 are constituted on a non-volatile memory 5 backed up with the backup power source and are used to perform the input/output control. Consequently, records are not lost since the records till then are present on either of a disk or input/output buffer 7 even when the power source is interrupted by trouble, operator's misoperation, etc. Thus, it is unnecessary to write contents and records of the file control table 6 on a disk device 3 every time the record output to cope with power-off is required and the number of times of the input/output of the disk device 3 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to record input/output control between a central processing unit and a disk device.

Conventional technology Conventionally, record input/output to a disk device was performed by configuring a file control table and an input/output buffer on the main storage device, and completing the file control table by reading the file's directory information from the disk when the file was opened. , records are input and output based on the contents of the file control table, the contents of the file control table are written to the disk directory when the file is closed, and the updated records on the crowded cover sofa are written to the disk.

The problem to be solved by the invention is that in the conventional system, when a file is opened as a disk input/output, reading of builfs 1 to 2 occurs, and when a file is closed, a directory is written and an update record is written on the input/output buffer.

By the way, when storing journal information in a terminal system, for example, it is necessary to write a record to disk each time a journal record is generated in order to prevent the journal record from disappearing due to a power outage, etc. To do this, files must be opened and closed. . Therefore, there is a drawback that the disk input/output of the above-mentioned directory and update record is required every time a journal record is generated.

The present invention has been made in view of the above-mentioned conventional circumstances,
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a new disk input/output control method that eliminates the above-mentioned drawbacks inherent in the conventional technology and makes it possible to reduce the number of inputs and outputs to a disk device.

Means for Solving the Problems In order to achieve the above object, the disk input/output control method according to the present invention is configured by forming a file control table and a human output buffer on a nonvolatile memory backed up by a backup power source. , so that records on the file control table and human output buffer are not lost even if the power is cut off. This eliminates the need to open and close files as described above, improving processing efficiency.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

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

Referring to FIG. 1, reference number 1 is a CPU (central processing unit), 2 is an IOP (input/output processing unit), 3 is a disk device, 31 is a directory, 32 and 33 are files, 4 is a main storage device, 41 is a program, 42 is a record buffer, 5 is a non-volatile memory, 6 is a file control table, 7 is an input/output buffer, 71.72.73.74 is a record in the input/output buffer, 8 is an input/output control according to the present invention Each mechanism is shown.

When the program 41 issues a file oven request, the input/output control mechanism 8 reads the corresponding file information from the directory 31 of the disk device 3, and
Completely defeat the file control table 6 of. Record input/output is controlled between the record buffer 42, the human output buffer 7, and the file 32 or 33 by the input/output control mechanism 8 based on information in the file control table 6.

When the program 41 issues a file close request, the input/output control mechanism 8 writes the contents of the file control table 6 in the nonvolatile memory 5 to the directory 31 of the disk device 3, and also writes the updated records 71 to 74. If there is, it is written to a file on disk device 3.

As described in detail, according to the present invention, a file control table and a human output buffer are configured on a non-volatile memory backed up by a backup power supply, and input/output control is performed using the non-volatile memory backed up by a backup power supply. Even if the power is cut off due to an operator error or the like, the records up to that point will remain on either the disk or the human output buffer, so the records will not be lost.

This eliminates the need to write the contents of the file control table and records to the disk device every time a record output request is made in order to cope with a power outage, so the number of inputs and outputs to the disk device can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. − G...CPU (Central Processing Unit), 2...IOP
(input/output processing device), 3... disk device, 31.
...Directory, 32.33...File, 4...
- Main storage device, 41... Program, 42... Record bar sofa, 5... Nonvolatile memory, 6... File control table, 7. Person output buffer, 71-74.
...Record, 8...I/O control mechanism

Claims (1)

[Claims] A disk input/output control method in a computer system that inputs and outputs records between a central processing unit and a disk device, characterized in that a file control table and an input/output buffer are configured on a nonvolatile memory backed up by a backup power source.