JPS63184960A - Data control system - Google Patents

Abstract

PURPOSE:To enhance the access efficiency to the file and to utilize uniformly the data domains on a disk by arranging the storing domains of file-control information approximately at the center of the data domain on the disk. CONSTITUTION:In the applied program (i.e. data-control mechanism) 1, the data-control mechanism 1 is incorporated with a means 2 for arranging an indexing cylinder 3 for storing the file-control information to be optimum position on the data domain of the magnetic disk and a means 3 for storing the file control information storing the file control information to an index cylinder 32 arranged by the optimum arranging means 2, so as to enhance the access efficiency to the file to insure the optimum position on the desk 30 for the storing domain of the file control information and to utilize uniformly the data domain of the disk.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data management system, and particularly to a data management system in an information processing system (hereinafter simply referred to as a system) including a central processing unit and a disk device.

[Conventional technology]

Traditionally, this type of data management method uses file names to manage files (data sets).

File management information such as file organization type, record length, block length, blocking coefficient, record number 2 creation date, update date, first record pointer, last record pointer, file last pointer, etc., for example 128 or 2
It is managed for each file as a fixed length of 56 bytes.

File management information is stored as a single file, including the volume list (Volume+w) of the O cylinder of the disk.
e Table of C+contents (hereinafter abbreviated as VToC), or is managed from the 0 area like the index cylinder of a floppy disk.
It was arranged and managed in cylinders (and one cylinder).

[Problem that the invention seeks to solve]

In the conventional data management method described above, the allocation position (starting address of the file) of file management information may depend on the system, which may reduce file access efficiency or reduce the average disk data area. It has the disadvantage that it is not commonly used.

In addition, in order to improve file access efficiency and equalize the use of disk data space, it is necessary to treat file management information as a fixed-length code and sort it by file name. The disadvantage is that it is necessary to optimize the file organization (mostly a modified sequential file) to be used, such as shortening the search time.

Furthermore, floppy disks have drawbacks such as the need to always read to cylinder 0 when accessing files.

In view of the above-mentioned points, an object of the present invention is to secure an area for storing file management information in the middle of the data area of a disk, thereby increasing the efficiency of accessing files.
An object of the present invention is to provide a data management method that allows the data area of a disk to be used evenly.

[Means for Solving the Problems] The data management method of the present invention arranges a storage area for file management information in the middle of a data area in a disk in a sensitive processing system including a central processing unit and a disk device. and a file management information storage means for storing the file management information in the storage area arranged by the optimal arrangement means.

[Effect]

In the data management method of the present invention, the optimal placement means arranges a storage area for file management information in the middle of the data area in the disk, and the file management information storage means stores the file management information in the storage area allocated by the optimal placement means. Store.

〔Example〕

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

FIG. 1 shows a data management mechanism (program) 1 to which a data management system according to an embodiment of the present invention is applied, and under the data management mechanism 1 is an index cylinder 32 (FIG. 3) that stores file management information. (see FIG. 3) at an optimal position in the middle of the data area of the magnetic disk 30 (see FIG. 3), and a file that stores file management information in the index cylinder 32 placed by the optimal placement means 2. Management information storage means 3 is included.

Referring to FIG. 2, an example of a system to which the data management method of this embodiment is applied is a central processing unit (hereinafter referred to as CPt).
(abbreviated as J) 11, a main storage device C (hereinafter referred to as memory) 12, a magnetic disk device 13, a disk control device 14 that controls the magnetic disk device 13, and other peripheral devices such as a keyboard and a display device. It is configured to include a peripheral control device 15 that controls the.

Referring to FIG. 3, the magnetic disk 30 to which the data management system of the present embodiment is applied has a VTOC area 31 in cylinder 0, and all cylinders (0 to M+N+1 cylinders) to substitute cylinders (M+1 to M+1 to The cylinders in the middle area (M/2 or (M+1)/2 cylinders) of the data cylinders (0 to M cylinders) excluding the maintenance cylinders (M+N cylinders) and maintenance cylinders (M1N+1 cylinders) are reserved as index cylinders 32. .

Referring to FIG. 4, the processing at the time of polynym initialization of the magnetic disk 30 includes a formatting step 41;
It consists of a VTOC information writing step 42, an index cylinder securing step 43, and an index cylinder start address setting step 44.

Referring to FIG. 5, the processing at system startup (TPL) includes a VTOC information reading step 51 and an index cylinder start address saving step 52.

Next, the operation of the data management system of this embodiment configured as described above will be explained.

When initializing the volume of the magnetic disk 30, first formatting is performed on all sides of the magnetic disk 30 (step 41), and VTOC information is written to the VTOC6N area 31 in cylinder 0 (step 42). 0
Next, the optimum placement means 2 calculates a cylinder position (M/2 or (M+1)/2 cylinder) in the intermediate area where the average seek distance is minimum within the data cylinder of the magnetic disk 30, and sets the cylinder position to this cylinder position. The index cylinder 32 is secured (step 43). Subsequently, the start address of the index cylinder 32 is set in the V T OC area 31 (step 44).

Next, when starting up the system, the V of the magnetic disk 30 is
Read the VTOC information from the TOCfJ area 31 (step 51), and read the index cylinder 3 included in the VTOC information.
2 is saved in the memory area of the data management mechanism 1 (a part of the area where file management information is summarized as a table, etc.) (step 52).

As a result, from now on, the VTO of the magnetic disk 30 will be
The index cylinder 32 can be directly searched without searching the C area 31, and a file having the target file name can be accessed at high speed.

The file management information storage means 3 stores the file management information edited on the memory 12 when creating a new file, that is, when the user secures a file area using a data management tool (utility) or the like. 1
2 is stored in the index cylinder 32 of the magnetic disk 30, which is an area secured by the optimum placement means 2.

In the above embodiment, a system using a magnetic disk device (a floppy disk device and a hard disk device) as a disk device was explained as an example, but the present invention can also be applied to a system using other disk devices such as an optical disk device or a magneto-optical disk device. Needless to say, it is also applicable to systems that

〔Effect of the invention〕

As explained above, the present invention improves the efficiency of file access by locating the storage area for file management information in the middle of the data area of the disk.
This has the effect that the entire data area of the disk can be used evenly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a data management method according to an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a system to which the data management method of this embodiment is applied, and FIG. 3 is a block diagram showing the configuration of a data management method according to an embodiment of the present invention. A diagram illustrating an area in a magnetic disk to which the data management method of the example is applied, FIG. 4 is a flowchart showing the processing at volume initialization in the data management method of the example, and FIG. 5 is a diagram illustrating the data of the example. 3 is a flowchart showing processing at the time of system startup in the management method. In the figure, 1...Data management mechanism, 2...Optimum arrangement means, 3...File management information storage means, 11...Central processing unit, 12...Main storage device, 13...Magnetism Disk device, 14... Disk control device, 15... Peripheral control device, 30... Magnetic disk, 31... vTOC area, 32... Index cylinder, 41... Formatting step, 42 ...V
TOC information writing step, 43... index cylinder securing step, 44... index cylinder start address setting step, 51... VTOC information reading step, 52... index start address saving step.

Claims (1)

[Claims] In an information processing system including a central processing unit and a disk device, an optimal placement means for arranging a storage area for file management information in the middle of a data area in a disk, and A data management method comprising: file management information storage means for storing the file management information in the storage area.