JPH05250242A - Computer system for distributed management of file information - Google Patents

Abstract

PURPOSE:To maintain a high file search speed by providing a third where a management file for search to perform the distributed management of file information of VTOC (volume table of contents) with one data file as the unit is stored. CONSTITUTION:A DF management file 21 collectively manages records for management of information of disks and those for management of information of files. This DF management file 21 is provided with a D management file 26 which manages records to manage divided disk information and an F management file 29 which manages records to manage file information. At the time of file search, records 24 and 25 to manage the information of the file are read to obtain the place of the block on VTOC where file information is described. The high file search speed is maintained because of this distributed management of file information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer system for managing file information about files on a disk by using VTOC.

[0002]

2. Description of the Related Art Conventionally, a computer system of this type manages file information by a VTOC in a disk storing a file, and in order to speed up a file search, a search management file is stored in another disk. Is provided.

[0003]

In the file information management method described above, since the file for storing the file information can be provided only on one disk, the file for storing the file information becomes large in capacity. However, if the file information cannot be stored in the file, the file information cannot be stored any more, and the file search cannot be speeded up.

In view of the above problems, it is an object of the present invention to provide a computer system capable of maintaining high speed file search without filling the disk storing the information even if the information for file search increases. To do.

[0005]

A computer system according to the present invention manages file information relating to a data file in a first disk with a VTOC, and can access the VTOC file information at a high speed for high speed name file search. A computer system for storing in a search management file of a second disk, which carries a search management file for distributed management of VTOC file information stored in the search management file of the second disk for each data file. Has a third disc.

Further, the search management file of the second disc stores the disc information of the first disc and the third disc.
The disc search management file preferably stores the file information of the first disc.

[0007]

If the information for file search increases and cannot be stored in the second disk, the information can be further stored by dividing the information for each data file and moving to the third disk. It becomes possible.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 are block diagrams showing the contents of the first and second disks of a computer system before the present invention is applied, and FIG. 3 is a search management in an embodiment in which the present invention is applied to that of FIG. It is a figure which shows the change of the content of a file.

First, the computer system shown in FIGS. 1 and 2 will be described. The first disk 11 stores the stored files 17, 18, and 19 in the VTOC 12 (Volume T
It is managed by "able of Contents".
The second disk 111 is a disk capable of high-speed file search, and the corresponding file management information is VT.
It stores a search management file 112 including records 113, 114, and 115 which relate to which block on the OC 12 is described.

Files 17 and 1 in the first disk 11
8 is an existing file, and the file 19 is newly created. Management information 1 in the block of VTOC12
3 and 14 are for the files 17 and 18, and the file management information 16 is to store new file information when the file 17 is updated.

Management file 11 of second disk 111
The second record 113, 114, 115 has the file management information VT for the files 17, 18, 19 respectively.
It is assumed that which block on the OC 12 is stored in association with the files 17, 18, and 19.

Therefore, when the file search speedup is designated for the first disk 11, the management file 112
Write records 113 and 114 above. When the user subsequently searches the files 17 and 18, the system first reads the records 113 and 114 and obtains in which block on the VTOC 12 the information of the files 17 and 18 is described. As a result, the file management information 13,
Read 14 to get the information in files 17 and 18. next,
When the file 19 is created, the file management information 15 regarding the file 19 is stored in a new block of the VTOC 12, and the record 115 regarding that is stored in the management file 112.
To store. Further, for example, when the file 18 is deleted, the record 114 is deleted. When the file 17 is further updated, new file management information 16 is written, and the record 1 indicates that the file information of the file 17 is in the VTOC12 file management information 16.
Update 13

Next, an embodiment in which the present invention is applied to the computer system shown in FIGS. 1 and 2 will be described with reference to FIGS.
This will be described with reference to (c). FIG. 3 (a) shows the second part of FIG.
Specifically, the DF management file 21 collectively manages records for managing disc information and records for managing file information. 3B and 3C are a D management file 26 that manages a record that manages a record that manages information of a disk into which the DF management file of FIG. 3A is divided, and a record that manages file information. 6 is a diagram showing an F management file 29 for managing the F management file 29.
Is stored on the third disk).

The DF management file 21 includes records 22 and 23 for managing disc information and records 24 and 25 for managing file information.

The D management file 26 includes records 27 and 28 for managing disc information. F management file 2
Reference numeral 9 denotes records 210 and 211 for managing file information.
including.

When the user separately designates the records 22 and 23 and the records 24 and 25 to the DF management file 21, the DF management file 21 becomes the D management file 26 in which the records 22 and 23 are left. , An F management file 29 including the records 24 and 25 is created.

Alternatively, if the record for managing the disk and the record for managing the file are specified separately from the beginning, files 26 and 29 are generated, and the information for managing the disk is stored in the file 26 of the second disk. , The file management information is the file 29 of the third disc.
Written in. When searching, updating, generating, or deleting a file, a record for managing information of the file is used as in the case of FIG. That is, when searching for a file, the records 24, 2 that manage the information of this file
5 is read to obtain the block number on the VTOC where this file information is described. This makes VTO
Read C to get file information. When updating a file, records 24 and 25 that manage the information of the file
To update. When creating a file, records 24 and 25 for managing the information of the file are created. When deleting a file, the records 24 and 25 that manage the information of the file are deleted. The files 26, 29 can be on separate disks. The file 29 including the management record of the file has a large capacity as the number of records increases.
The situation where the area 9 cannot be secured due to lack of disk capacity is avoided.

[0018]

As described above, according to the present invention, the file information is VT in order to speed up the search of the file in the first disc whose file information is managed by VTOC.
If a search management file for the second disk that has a record that correlates with which block of the OC is described, the number of files increases and the management file secures an area due to insufficient disk capacity. Even if the number becomes impossible, the file information is divided into files on the third disk and written, and distributed management is performed, so that the speed of file search can be continued, and the two management files can be linked in the system. As in the case where there is one management file, there is an effect that the information of the file in the first disk, which manages the file information by VTOC, can be centrally managed.

[Brief description of drawings]

FIG. 1 is a block diagram showing the contents of a first disk of a computer system before the present invention is applied.

FIG. 2 is a block diagram showing the contents of a second disk of the computer system before applying the present invention.

FIG. 3A is a diagram specifically showing the contents of a management file 112 in the second disc of FIG. (B) is
D management file 26 that manages a record that manages information on the disc after the DF management file in (a) is divided
It is a figure which shows the content of. (C) is a figure which shows the content of the F management file 29 which manages the record which manages the information of the file after the DF management file of (a) was divided.

[Explanation of symbols]

11 First Disk 12 VTOC 13, 14, ..., 16 File Management Information 17, 18, 19 File 21 DF Management File 22, 23, 24, 25, 113, 114, 115
Record 26 D management file 29 F management file 111 Second disk 112 Management file

Claims (2)

[Claims] 1. A VTOC manages file information related to a data file in a first disk, and stores the VTOC file information in a search management file of a second disk which can be accessed at high speed for high speed file search. VT stored in the search management file of the second disk in the computer system
A computer system having a third disk carrying a search management file for distributedly managing OC file information for each data file. 2. The search management file of the second disk stores the disk information of the first disk, and the search management file of the third disk stores the file information of the first disk. Computer system described.