JPH0262624A - Vtoc recovering device for magnetic disk device - Google Patents

Abstract

PURPOSE:To quickly recover VTOC (volume table contents) information having a fault by searching an auxiliary label where the same information as a file label is recorded. CONSTITUTION:A magnetic disk device 2 is provided with the file labels 211 and 212 storing the file names and the area start/end addresses within a VTOC area 21 and the auxiliary labels 221 and 222 having the same information as the labels 211 and 212 outside the area 21. When the area 21 is lost due to the fault, an input information check part 11 reads the parameter of the number of a magnetic disk device to be recovered out of a parameter buffer 5 and checks the propriety of recovery. An auxiliary label reading part 12 reads the labels 221 and 222 of the device 2 and stores them into a label buffer 6. An auxiliary label editing part 13 sorts the labels 221 and 222 of the buffer 6 in order of allocation dates. A file label writing part 14 writes the sorted labels 221 and 222 into the area 21 as the file labels.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic disk drive, and in particular to a magnetic disk drive with VTOC (Volume+e Table C).
This invention relates to a device for restoring a VTOC based on an auxiliary label when a VTOC (contents) is destroyed due to some reason.

2. Description of the Related Art Conventionally, medium management information of a magnetic disk device is broadly divided into a VTOC and a file (data) area.

VTOC includes FDP address, physical sector length, etc.
A file directory file (FDP) consisting of a volume label storing information indicating the volume name and volume attributes of the volume, and a file label group recording management information of each file;
It consists of a free space directory file (FSDF) for managing free space on the disk.

The data file in the file area is accessed using the FDP file management information in this VTOC.

If the VTOC is erased or becomes invalid due to some reason, such as initializing the VTOC of the magnetic disk medium in some way, the data will be deleted even though the data is physically stored in the file area. Zu, F
Access is not possible because there is no DP information.

To restore the VTOC, if the previous FDP information is output as a parameter in the list, the volume will be regenerated based on it, the file will be allocated from the list information, and then the data file will be restored. The most common method is when to do it.

Another effective recovery method is to copy the VTOC to another medium in a timely manner, similar to the general recovery method for data files.

Problems to be Solved by the Invention In the conventional VTOC recovery method described above, when FDP information is not output to a list etc., the file label at the beginning of each file is extracted from the data (file) area of the magnetic disk. It is necessary to search for it in the dump list etc.
This task is extremely difficult.

Furthermore, even if FDP information is output, there may be a discrepancy with the information at the time of failure, and there is a drawback that it takes a long time (3 to 4 hours) for accurate recovery.

The present invention has been made in view of the above-mentioned conventional situation,
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel VTOC recovery device for a magnetic disk device that makes it possible to eliminate the above-mentioned drawbacks existing in the conventional technology.

Means for Solving the Problems In order to achieve the above object, the VTOC recovery device for a magnetic disk device according to the present invention provides, in addition to a file label having various file information on the magnetic disk device, an auxiliary label having similar information. An input information check unit that diagnoses the validity of information input by the operator based on the auxiliary label of a magnetic disk device that has a label at the beginning of the file area, and an auxiliary label reader that reads the auxiliary label and stores it in a label buffer. The CPLI includes a CPLI, an auxiliary label v4 collection unit that rearranges the data in the label buffer, and a file label writing unit that writes the data in the label buffer to the VTOC.

In other words, the "magnetic disk device VTOc recovery J" of the present invention is
The target is a magnetic disk device that manages file management information as an area following the beginning of the magnetic disk, and at the same time stores the above information as an auxiliary label in the beginning area of each file. By reading and writing into the VTOC as a file label, the VTOC can be quickly restored and each data can be used.

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.

Configuration Referring to FIG. 1, a magnetic disk device V according to the present invention
The old TOCi device has an input information check section 11, an auxiliary label reading section 12, an auxiliary label 12i & section 13,
A CP consisting of a file label writing section 14
Input device (keyboard) 3 connected to υ1,
It is composed of an output device (display) 4, a parameter buffer 5 which is a memory, and a label buffer 6, and processes the magnetic disk device 2.

The function input +7t II check section 11 has a function of diagnosing the validity of the parameters stored in the parameter buffer 5 (the magnetic disk device number to be restored and restoration information indicating whether or not to perform restoration).

The auxiliary label reading section 12 has a function of storing an auxiliary label in the magnetic disk device 2 in the label buffer 6.
The auxiliary label R, l collection section 13 has a function of rearranging the auxiliary label data in the label buffer 6 in order of allocation date.

The file label writing unit 14 writes the auxiliary label data in the label buffer 6 to the VTOC 21 of the magnetic disk device 2.
Using the operational keyboard 3, which has the function of writing a file label to a file, enter the number of the magnetic disk device to be processed (if a plurality of magnetic disk devices are connected) and whether or not to restore the VTOC of that magnetic disk device.

The input parameters (information) are stored in the parameter buffer 5.

An input information checking unit 11 in the CPU 1 diagnoses the validity of the parameters (information) stored in the parameter buffer 5.

If the validity is not recognized by the validity diagnosis, the input information check section 11 outputs an error message on the display 4 to the effect that the validity of the parameter (information) is not recognized.

Further, if the validity of the parameters (information) is recognized, the input information check section 11 outputs a message on the display 4 to the effect that the restoration process is in progress.

Next, the auxiliary label reading section 12 in the CPU l
control is transferred to

111 Auxiliary label reading unit 12 reads an auxiliary label 221 or 222 existing in the magnetic disk device 2.
etc. are searched and read sequentially from the beginning on the magnetic disk medium and stored in the label buffer 6 in an orderly manner.

The auxiliary label 221 or 222 contains the same file information as the file label 211 or 212 existing in the VTOC 21 (file name, file organization, record length, block length, number of valid records, allocation date, area start address, area end address). etc.) are stored.

When the process of storing all the auxiliary labels in the magnetic disk device 2 in the label buffer 6 is completed, control is transferred to the auxiliary label editing section 13 in the CI'Ul.

The auxiliary label editing unit 13 rearranges the auxiliary label data stored in the label buffer 6 in the order of the oldest file allocation date of each of the auxiliary label data.

Once the auxiliary label data in the label buffer 6 has been rearranged in the above order, control is transferred to the file label writing unit 14 in the CPU 1.

The file label writing unit 14 sequentially writes the auxiliary label data rearranged in the order of allocation date information in the label buffer 6 into the VTOC 21 in the magnetic disk device 2 as a file label.

All auxiliary label data in label buffer 6 is VTO
Once written in C21, a message to the effect that the restoration process has been completed is displayed on the display 4 to notify the operator.

Through the above series of operations, the VT in the magnetic disk device 2
If OC21 is destroyed for some reason, VT
The OC 21 is restored and each file in the device is made available to the user.

In the embodiment described above, all file labels are to be recovered. However, each time the auxiliary label reading unit 12 in the CPtJ1 reads one auxiliary label in the magnetic disk device 2, its contents are displayed on the display 4. It is also possible to restore the files while selecting the file labels to be restored by outputting them and having the operator check them one by one.

Furthermore, in this embodiment, each file has its own auxiliary label, but as shown by reference numeral 7 in FIG.
If the auxiliary VTOC is made to exist in the data file area and used as recovery data, the time for recovery will be further shortened.

As described in detail, according to the present invention, by simply inputting simple recovery information, VTOC information can be quickly recovered, which previously took a long time, and the disappearance of large amounts of data resources can be prevented. This effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1...CPU, 11...Input information check section, 1
2... Auxiliary label reading unit, 13... Auxiliary label editing unit, 14... Auxiliary label IF importing unit, 2... Magnetic disk device, 21... VTOC1211... File label of file A. 212...File label of file B, 221...Auxiliary label of file A, 222...Auxiliary label of file B, 2211...Data area of file A, 2221...Data area of file B, 3...Keyboard,...Display label buffer 5...Parameter buffer, 6...

Claims (1)

[Claims] In addition to a file label containing various file information on the magnetic disk device, a magnetic disk device has an auxiliary label with the same information at the beginning of the file area.Based on the auxiliary label, the validity of the information input by the operator is verified. an input information checking unit that diagnoses the auxiliary label; an auxiliary label reading unit that reads the auxiliary label and stores it in a label buffer; an auxiliary label editing unit that rearranges the data in the label buffer; and writes the data in the label buffer to the VTOC. 1. A recovery device for a magnetic disk device, comprising a CPU having a file label writing section.