JPH03212856A - Disk device - Google Patents

Abstract

PURPOSE:To eliminate the need for an alternative work after a power source is applied next at a computer side when the alternative work is interrupted by preparing a part where an identifier representing the process of the alternative work and the content of a data block to be alternated are stored in a magnetic disk, and managing it at a magnetic disk device side. CONSTITUTION:The identifier representing the process of interrupted work is written on and preserved in a certain area decided in a magnetic disk device 21. The identifier is rewritten just before each work constituting the alternative work is started and immediately after the pre-work of the alternative work is completed. A disk control circuit 212 judges whether or not it is necessary to continue the alternative work from the identifier immediately after the power source of the magnetic disk device 21 is applied, and judges from which work constituting the alternative work the work should be started when it is necessary to continue the alternative work, and starts the work. In such a manner, the interrupted alternative work can be restarted and completed immediately after the power source is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk device, and more particularly to resuming a substitute operation for an interrupted data block.

[Conventional technology]

Conventionally, in systems that have a computer and a disk device such as a magnetic disk device, if the power goes out and the work is interrupted during data block replacement work, the computer side performs the replacement work the next time the power is turned on. . That is, the computer memorizes the fact that the work has not been completed and the contents of the data block to be replaced, and based on this, the computer continues the replacement work.

Alternatively, if the magnetic disk device remembers that it has started an alternative task but has not completed it, and the computer issues an instruction to read or write data after the next power is turned on, the instruction The continuation of the alternative work was performed immediately before executing the action.

[Problem to be solved by the invention]

In the former case, where the computer side performs the substitution, the computer side needs to start the substitute work and remember that the work has not been completed. Furthermore, a processing program for this case must be prepared on the computer side. Additionally, a location for storing the contents of the replaced data block must be allocated within the magnetic disk drive under the control of the computer, and when replacing the magnetic disk drive with a larger capacity one, , it requires man-hours to change the program on the computer side.

Furthermore, in the latter case, when the magnetic disk device issues an instruction for the computer to read or write data after the power is turned on, the alternative task is continued immediately before executing the operation for that instruction. Since the alternative work is continued before execution, there is a drawback that the response time to the command is longer than in the normal case.

[Means to solve the problem]

The disk device of the present invention includes a control circuit that has the function of controlling the operation of the disk drive and the function of performing an alternative operation of substituting a data block in the disk drive to a location different from the location of the data block in the disk drive. The present invention is characterized by having a function of restarting and continuing the interrupted work after power is turned on, when the alternative work is interrupted.

〔Example〕

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

FIG. 1 is a flowchart of an operation for continuing an interrupted alternative work immediately after power is turned on, in an embodiment of the present invention;
FIG. 2 is a block diagram showing one embodiment of the present invention, FIG. 3 is a partial configuration diagram of this embodiment, and FIG. 4 is a diagram showing block numbers of some trucks in alternative work.

First, referring to FIG. 2, in one embodiment of the present invention, a computer 20 uses a magnetic disk device 21 as a data storage device to read and write data. If an error is found in the pig block while reading or writing data to the magnetic disk device 21,
The computer 20 issues an instruction to the magnetic disk device 21 to replace the data block in which the error has been detected. The magnetic disk device 21 performs the alternative work in accordance with this command. For example, while the magnetic disk device 21 is performing alternative work, the work is interrupted due to a power failure due to a power outage, etc.
If the power is turned on again after that, the magnetic disk device 21 immediately continues the interrupted alternative work.

Next, referring to FIG. 3, the instructions from the computer 20 are as follows:
Interface 22 and interface processing circuit 21
1, the disk control circuit 212 receives the signal.

The disk control circuit 212 includes an operation control circuit 213 that controls spindle motor operation and seek operation, and a storage control circuit 21 that controls data reading and writing.
4, the magnetic disk drive 215
Controls the operation of.

In the magnetic disk device 21, during normal operation, the disk control circuit 212 interprets the command received by the interface processing circuit 211, and the magnetic disk drive 215 interprets the command specified by the command through the operation control circuit 213 and the storage control circuit 214. control to perform the specified action.

The case where the substitute work is continued immediately after the power is turned on after being interrupted will be explained.

Something that indicates the progress of the interrupted alternative work is called an identifier.

This is a number that indicates that no substitute work is being performed if no substitute work is being performed, and a number that indicates the work of each work that constitutes the substitute work when substitute work is being performed.

The identifier is written and saved in a certain predetermined area of the magnetic disk device 21. The identifier is rewritten immediately before the start of each task that constitutes the alternative task and immediately after the completion of the preceding task of the alternative task.

Immediately after power is turned on to the magnetic disk device 21, the disk control circuit 212 determines from the identifier whether or not it is necessary to continue the alternative work, and if it is necessary, determines which work in the alternative work should be started. , start from that work.

The disk control circuit 212 is operated by an operation control circuit 213.
and the magnetic disk drive 2 through the storage control circuit 214.
15 operations. At this time, the computer side is notified through the interface processing circuit 211 that preparations for executing instructions from the computer side are complete.

Next, the alternative work will be explained with reference to FIG.

The replacement work involves evacuating the data of the previous block in the track containing the replacement optical block to the evacuation track (for example,
As shown in the track 41 before the alternative work in FIG. 4, in the track including blocks N to N+5, block N+
2 is used as the replacement source, as shown in the track after the replacement work, the replacement source block is made into an unused block that is not used as a block for writing data, and the rearrangement of that block and the following blocks is performed using those blocks. (work to be performed on the track containing the replacement block) and work to return the data saved in the save track to the track containing the replacement source block.

Next, with reference to FIG. 1, the operation when continuing the interrupted alternative work in this embodiment will be explained.

After turning on the power, initial settings and control of the spindle motor up to steady rotation are performed (step 11).

Next, in step 12, it is determined whether alternative work is necessary. Here, if the identifier indicating the progress of the substitute work indicates that the substitute work was interrupted without being completed, the substitute work is required. If it is determined in step 12 that alternative work is not necessary, normal processing is performed. If it is determined in step 12 that alternative work is necessary, resume the interrupted alternative work based on the information of the identifier indicating the progress of the alternative work that was stored at the time of interruption. Find a location and restart from there (step 13).

Next, in step 14, it is determined whether the alternative work has ended normally. If it is abnormal, it is reported to the computer side (step 16).

If normal, set an identifier indicating the progress of the alternative work to indicate that the alternative work has been completed (step 15);
Go to normal processing (step 17). In normal processing,
Each circuit is controlled to perform the necessary operations based on instructions issued by the computer.

〔Effect of the invention〕

As explained above, in the present invention, the magnetic disk device has a place in the magnetic disk device for storing an identifier indicating the progress of the substitution work and the contents of the data block to be substituted, and the magnetic disk device side Through this management, even if the power is turned off during an alternative work and the work is interrupted, there is no need for the computer to carry out the interrupted alternative work after the next power is turned on.

Furthermore, when replacing the magnetic disk device with one with a larger capacity, for example, there is an effect that the portion of the man-hours involved in changing the program on the computer side related to the execution of the interrupted replacement task is eliminated.

Furthermore, by restarting and completing the interrupted alternative work immediately after power is turned on, there is no need to continue the alternative work in subsequent processing of instructions from the computer side. Therefore, the response time is reduced, and when the computer side schedules the instruction execution time, there is no need to consider the time required to continue the alternative work.

[Brief explanation of drawings]

FIG. 1 is a flowchart of an operation for continuing an interrupted alternative work immediately after power is turned on, in an embodiment of the present invention;
FIG. 2 is a block diagram showing one embodiment of the present invention, FIG. 3 is a partial configuration diagram of this embodiment, and FIG. 4 is a diagram showing block numbers of some trucks in alternative work. 20... Computer, 21... Magnetic disk device, 22
...Interface to the computer side, 211...Interface processing circuit, 212...Disk control circuit,
213...Operation control circuit, 214...Storage control circuit, 215...Magnetic disk drive, 41...Track before alternative work, 42...Track after alternative work.

Claims (1)

[Claims] 1. In a disk device that performs an alternative operation of replacing a data block on a disk with a different location, when the alternative operation is interrupted due to a power cut, the interrupted alternative operation is
A disk device characterized by restarting after power is turned on again. 2. The disk device according to claim 1, wherein an identifier indicating the progress of the alternative work and a data block in which an error has been discovered are stored. 3. The disk device according to claim 2, wherein the identifier and the error data block are used when restarting the alternative work.