JPS62145320A - Magnetic disk controller - Google Patents

Abstract

PURPOSE:To eliminate a waste of time in re-execution by providing a magnetic disk controller with a storage circuit which stores the address of a track where trouble occurs. CONSTITUTION:When receiving an indication for copying data written in a magnetic disk device 13 to a magnetic disk device 140 from a central processor through a line 201, a magnetic disk processing circuit 110 writes the data read out of the device 130 in the device 140 to take a copy. The circuit 110 stored the address of a track of the device 130 or 140 where trouble occurs in the storage circuit 120 through a line 202 and restarts copying operation at a track next to said track unless the copying can not be performed in the middle owing to the trouble. When the copying operation is finished, the address of the track where the trouble occurs which is stored in the circuit 120 is sent out to the central processor. The central processor copies only the sent-out track.

Description

[Detailed Description of the Invention] The present invention relates to a magnetic disk system, and particularly relates to a magnetic disk system, in which data written in a magnetic disk system is transferred to other devices. This relates to a method of copying to a magnetic disk device.

2. Description of the Related Art Conventionally, a method for copying data written in a magnetic disk device using this type of magnetic disk control device has been as follows. In other words, when a failure occurs in a track while data written in a magnetic disk device is being copied to another magnetic disk device, the magnetic disk control device terminates the copying and changes the address of the track. is sent to the central processing unit. Because the copy did not complete normally, it must be completed normally (when re-executing the copy, the error occurs on the failed server).

However, if a failure occurs again during copying, the magnetic disk controller uses the method described above to re-execute the copying until it completes normally. Whenever a problem occurs, the central processing center E'J! 'The J location had to send out an indication to re-execute the copy, resulting in wasted time.

Problems to be Solved by the Invention In the conventional magnetic disk control device described above, when data written in a magnetic disk device is copied to another magnetic disk device, each time a failure occurs during copying, the central This method has the disadvantage that time is wasted because the processing device must send out a copy re-execution instruction.

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

Means for Solving the Problems In order to achieve the above object, the magnetic disk control device according to the present invention prevents the occurrence of a failure when copying data written in a magnetic disk device to another magnetic disk device. A memory circuit that stores the address of the track that was copied and an address of the track that could not be copied due to some failure during copying are stored in the memory circuit, and copying is restarted from the track with the next address, and the copying process is continued. The magnetic disk processing circuit is configured to include a magnetic disk processing circuit that sends a report of the completion of copying and the address of the track that could not be copied, which is stored in the storage circuit, to the central processing unit when copying is completed.

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.

In FIG. 1, a magnetic disk control device according to the present invention +
00 is a magnetic disk processing circuit +10, a storage circuit 12
Consists of 0.

The magnetic disk processing circuit 110 is connected to a wire 2 from the central processing unit.
When receiving an instruction to copy the data written in the magnetic disk device 130 to the magnetic disk device 140 through the line 203, the data read from the magnetic disk device 130 through the line 203 is written to the magnetic disk device 14G through the line 204. Make a copy. When a failure occurs in a certain track of the magnetic disk device 130 or the magnetic disk device 140 during copying and copying cannot be performed, the magnetic disk processing circuit 110 stores the address of the track in the storage circuit 120 through the line 202, and , copying resumes from the track at the next address of the truck. Even if a failure occurs again during copying, the magnetic disk processing circuit 110 executes the copying using the above-mentioned means, and when the copying is completed, sends the data to the central processing IT via line 201.
The completion of copying is reported to the storage circuit +20.
The address of the track that could not be copied, read through the twisted wire 202, is sent to the central processing unit through the line 201. When the central processing unit re-executes copying in order to complete the copying normally, the central processing unit uses the magnetic disk processing circuit +10.
Only those tracks that were sent out and could not be copied are copied.

As described in detail, according to the present invention, when data written in a magnetic disk device is copied to another magnetic disk device, a failure occurs in a track in the middle of the copying and the copying is not possible. If there is no problem, copying is restarted from the next address track of the trunk, and when copying is completed, the address of the track where the failure occurred is sent to the central processing unit, so that copying can be completed normally. When re-executing the process, it is necessary to copy only the track in which the failure has occurred, thereby saving time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. +00, , magnetic disk control device, 110,
, .

Claims (1)

[Claims] In a magnetic disk control device that is connected to a central processing unit and operates according to instructions from the central processing unit to control a plurality of magnetic disk devices, data written in the magnetic disk devices is transferred to other magnetic disk devices according to instructions from the central processing unit. A magnetic disk control device that has the function of copying to a magnetic disk device, which includes a memory circuit that stores the address of the track where a failure occurred during copying, and the address of the track that could not be copied due to some failure during copying. is stored in the memory circuit, copying is resumed from the track at the next address, and when the copying is completed, the central processing unit sends a report of the completion of copying and the address of the track that could not be copied, which is stored in the memory circuit. 1. A magnetic disk control device comprising: a magnetic disk processing circuit that sends data to a magnetic disk;