JPH07191808A - Magnetic disk processor - Google Patents

Abstract

PURPOSE:To improve the throughput of the magnetic disk processor due to data correcting processing. CONSTITUTION:When a command status input/output circuit 31 receives the reading instruction of data from a central processing unit 10 to a magnetic disk device 20, a processor 32 decodes that instruction and inquires conditions to a storage circuit A36, which stores whether any correctable data error is generated or not for each area of an address, with the cylinder/head address of data to be read and a record number as those addresses. When no error is generated, the command of data reading is outputted to a magnetic disk control circuit 33 and a data transfer control circuit 34. The control circuit 33 issues a data reading instruction to the device 20. Data are successively read from the device 20, transmitted through the data transfer control circuit 34 to the unit 10 and decoded by an arithmetic circuit 35, the error is checked and when the data are completely transferred, the arithmetic result is reported from the arithmetic circuit 35 to the processor 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing device,
In particular, it relates to the processing of correctable data errors in magnetic disk processing devices.

[0002]

2. Description of the Related Art A conventional magnetic disk processing apparatus will be described with reference to the drawings.

FIG. 5 is a block diagram of a system using a conventional magnetic disk processing apparatus.

In the correctable data error processing in the conventional magnetic disk processing device 50, when an error correction code (hereinafter referred to as ECC) is added to the data read from the magnetic disk device 20, The data is sent to the central processing unit 10 via the data transfer circuit 53, and at the same time, it is input to the ECC operation circuit 54 to check the data. Based on the check result, the processor 52 knows the correctable data error, reads the correction information from the ECC operation circuit 54, and sends the data transfer abnormality report and the correction information to the central processing unit 10 via the command status input / output circuit 51. Alternatively, the magnetic disk processing device 50
The data was corrected inside and sent to the central processing unit 10.

[0005]

In the correctable data error processing in the above-mentioned conventional magnetic disk processing apparatus, the correction processing is required every time the data to be corrected is read, which lowers the processing capacity of the magnetic disk processing apparatus. There was a problem.

[0006]

A magnetic disk processing apparatus according to the present invention is located between a central processing unit and a magnetic disk apparatus and has a function of correcting data read from the magnetic disk apparatus. And a command status input / output circuit for receiving or sending a response from the central processing unit, and a processor for receiving the command from the command status input / output circuit and communicating with the central processing unit and controlling the magnetic disk unit. And a magnetic disk control circuit that controls the magnetic disk device according to instructions from the processor, a data transfer control circuit that controls the sending of read data from the magnetic disk device to the central processing unit, and check the data by inputting the read data. And the operation result of the operation circuit A means for notifying the processor and a cylinder / head address and record number at the time of reading of the magnetic disk device are used as addresses to store whether or not a correctable data error has occurred for each area of that address, and a correctable data error occurs to the processor. And a storage circuit A having means for notifying the status, and a storage circuit B capable of storing cylinder / head addresses and record numbers, data length and corrected data by the processor and reading the data to the processor. I am trying.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

First, the first invention will be described.

FIG. 1 is a block diagram of a system using an embodiment according to the first invention.

This system comprises a central processing unit 10, a magnetic disk unit 20, and a magnetic disk processing unit 30a.

Further, the magnetic disk processing apparatus 3 of this embodiment
0a is a command status input / output circuit 31 for receiving a command from the central processing unit 10 or transmitting a response,
A processor 32 that receives an instruction from the command status input / output circuit 31 to communicate with the central processing unit 10 and control the magnetic disk device 20, and a magnetic disk control circuit 33 that controls the magnetic disk device 20 according to an instruction from the processor 32. And a data transfer control circuit 34 for controlling transmission of read data from the magnetic disk device 20 to the central processing unit 10, and inputting read data from the magnetic disk device 20 to check the data and perform a calculation as to whether or not the data can be corrected. An arithmetic circuit 35, means for notifying the arithmetic result of the arithmetic circuit 35 to the processor 32, and a cylinder / head address and record number at the time of reading of the magnetic disk device 20 as an address, and a correctable data area is generated for each area of the address. Memorize or A storage circuit A36 having means for notifying the occurrence status of a possible data error, and a storage circuit B37 capable of storing cylinder / head address and record number, data length and corrected data by the processor 32 and reading the data to the processor 32. It consists of and.

Next, the operation will be described.

From the central processing unit 10 to the magnetic disk unit 2
When the command status input / output circuit 31 receives a data read command for 0, the processor 32 decodes the command, and the processor 32 uses the cylinder / head address and record number of the data to be read as an address area. Storage circuit A36 that stores whether or not a correctable data error has occurred for each
Inquire about the situation. When the correctable data error does not occur in the data to be read, the magnetic disk control circuit 33 and the data transfer control circuit 34 are instructed to read the data. Next, the magnetic disk control circuit 33 issues a data read command to the magnetic disk device 20.

Thereafter, data is read from the magnetic disk device 20 at any time and sent to the central processing unit 10 via the data transfer control circuit 34.

Further, the transmitted data is arithmetically decoded by the arithmetic circuit 35 to check for a data error, and when the data transfer is completed, the arithmetic circuit 35 notifies the processor 32 of the arithmetic result.

When a series of data transfer is completed without any error, the central processing unit 10 is notified via the command status input / output circuit 31 that the processing has been completed normally, and the processing is completed.

Next, the operation when a correctable data error occurs after the data transfer is completed will be described.

When the arithmetic circuit 35 notifies the processor 32 that there is a correctable data error, the processor 32 reads the correction information from the arithmetic circuit 35, corrects the data, and inputs / outputs the command status to / from the central processing unit 10. A report indicating that there is an error and correction data are transmitted via the circuit 31.

Further, when the processor 32 uses the cylinder / head address and record number of the data read to the memory circuit A36 as an address, a correctable data error has occurred in the area of the address and the head offset is being executed. The fact is stored.
Further, the cylinder / head address where the correctable data error has occurred, the data length of the record number, and the corrected data are stored in the memory circuit B37.

From the central processing unit 10 again, the same cylinder /
When the command status input / output circuit 31 receives the read command for reading the data of the head address and the record number, the processor 32 uses the cylinder / head address and the record number of the data to be read as the address and correctable data in the area of the address. The storage circuit A36, which stores whether or not an error has occurred, is inquired about the situation, knows that a correctable data error has occurred, does not read the data from the magnetic disk device 20, and causes the processor 32 to read the data from the storage circuit B37. Then, a report indicating that there is an error and correction data are transmitted via the command status input / output circuit 31.

Next, the second invention will be described with reference to the drawings.

FIG. 2 is a block diagram of a system using an embodiment according to the second invention.

This system comprises a central processing unit 10, a magnetic disk unit 20, and a magnetic disk processing unit 30b.

Further, the magnetic disk processing apparatus 3 of this embodiment
0b is the magnetic disk processing device 30a of the first invention.
A monitoring circuit 38 for monitoring the operating states of the central processing unit 10 and the magnetic disk device 20 via the command status input / output circuit 31 and the magnetic disk control circuit 33 and notifying the processor 32; A notification circuit 39 for notifying the area 32 of whether or not there is a correctable data error, and the data of the memory circuit A36 and the memory circuit B37 controlled by the processor 32.
Data write control circuit 4 for controlling the writing of data to the magnetic disk device 20 via the magnetic disk control circuit 33 and the data transfer control circuit 34 using
It is configured to have 0 and.

Next, the operation will be described.

Central processing unit 10 and magnetic disk unit 20
The operating state of is monitored via the command status input / output circuit 31 and the magnetic disk control circuit 30, and if there is a vacancy in the operation, the monitoring circuit 33 notifies the processor 32 to that effect.

When the processor 32 detects that there is a vacancy in the operation of the magnetic disk processing device by the above two notifications, the data in the memory circuit A36 and the data in the memory circuit B37 are used to notify the magnetic disk device 20. The data write control circuit 40 writes the corrected data via the magnetic disk control circuit 33 and the data transfer control circuit 34.

The other operations are similar to those of the first invention.

Next, the third invention will be described with reference to the drawings.

FIG. 3 is a block diagram of a system using an embodiment according to the third aspect of the present invention.

This system comprises a central processing unit 10, a magnetic disk unit 20, and a magnetic disk processing unit 30c.

Further, the magnetic disk processing apparatus 3 of this embodiment
0c is the magnetic disk processing device 30b of the first invention.
However, the memory circuit A36 is provided with a memory circuit C41 in which a means for counting and storing a correctable data error in the same cylinder / head and notifying the processor 32 when a fixed count value is reached is added. .

Next, the operation will be described.

When a correctable data error occurs during data reading from the magnetic disk device 20, the memory circuit C4
At 1, a count is stored as to whether or not a correctable data error has occurred in the same cylinder / head, and the processor 32 is notified when a fixed count value is reached. The processor 32 reports to the central processing unit 10 via the command status input / output circuit 31. Therefore, maintenance such as defective replacement processing is performed.

The other operations are similar to those of the first and second inventions.

Next, the fourth invention will be described with reference to the drawings.

FIG. 4 is a block diagram of a system using an embodiment according to the fourth aspect of the present invention.

This system comprises a central processing unit 10, a magnetic disk unit 20, and a magnetic disk processing unit 30d.

Further, the magnetic disk processing apparatus 3 of this embodiment
0d is the magnetic disk processing device 30b of the second invention.
However, a memory circuit D in which means for reading the cylinder / head address value to the processor 32 is added to the memory circuit A36
42, and a defective substitution control circuit 43 which is controlled by the processor 32 and performs defective substitution processing when the processor 32 is notified by the memory circuit D42.

Next, the operation will be described.

When a correctable data error occurs during data reading from the magnetic disk device 20, the memory circuit D4
In 2, the CPU 32 counts and stores whether or not a correctable data error has occurred in the same cylinder / head, and notifies the processor 32 when a constant count value is reached. The processor 32 reads the cylinder / head address value from the memory circuit D42, and uses the data of the memory circuit B37 to perform the defect replacement processing from the defect replacement control circuit 43 via the magnetic disk control circuit 33 and the data transfer control circuit 34.

The other operations are similar to those of the first and second inventions.

[0043]

As described above, the magnetic disk device processing apparatus of the present invention has means for grasping and processing the correctable data error occurrence state when data is read from the magnetic disk device, so that When a data read correctable data error occurs again, there is an effect that the correction process is not performed and the data can be sent to the central processing unit, and the processing capacity of the magnetic disk processing device can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a system using an embodiment according to the first invention.

FIG. 2 is a block diagram of a system using an embodiment according to the second invention.

FIG. 3 is a block diagram of a system using an embodiment according to the third aspect of the present invention.

FIG. 4 is a block diagram of a system using an embodiment according to the fourth invention.

FIG. 5 is a block diagram of a system using a conventional magnetic disk processing device.

[Explanation of symbols]

10 central processing unit 20 magnetic disk unit 30a, 30b, 30c, 30d magnetic disk processing unit 31 command status input / output circuit 32 processor 33 magnetic disk control circuit 34 data transfer control circuit 35 arithmetic circuit 36 storage circuit A 37 storage circuit B 38 monitoring Circuit 39 Notification circuit 40 Data write control circuit 41 Storage circuit C 42 Storage circuit D 43 Failure replacement control circuit 50 Magnetic disk processing device 51 Command status input / output circuit 52 Processor 53 Data transfer control circuit 54 ECC arithmetic circuit

Claims (4)

[Claims] 1. A magnetic disk processing device which is located between a central processing unit and a magnetic disk device and has a function of correcting data read from the magnetic disk device. A command status input / output circuit for receiving or sending a response, a processor for receiving an instruction from the command status input / output circuit to communicate with the central processing unit and control the magnetic disk device, and a command from the processor A magnetic disk control circuit for controlling the magnetic disk device, a data transfer control circuit for sending and controlling read data from the magnetic disk device to the central processing unit, and inputting the read data to check and correct the data An arithmetic circuit for performing whether or not the operation result of the arithmetic circuit A means for notifying the processor and a cylinder / head address and a record number at the time of reading of the magnetic disk device as an address can be corrected for each area of the address and a data error can be stored and can be corrected for the processor. Memory circuit A having means for notifying the data error occurrence status
And a memory circuit B capable of storing cylinder / head address and record number, data length and corrected data by the processor and reading the data to the processor.
And a magnetic disk processing device. 2. A monitoring circuit for monitoring the operating states of the central processing unit and the magnetic disk device via the command status input / output circuit and the magnetic disk control circuit and notifying the processor, A notifying circuit for notifying the processor whether there is an area where a correctable data error has occurred from data, and the magnetic disk device using the data of the memory circuit A and the data of the memory circuit B controlled by the processor. 2. A magnetic disk processing apparatus according to claim 1, further comprising a data write control circuit for controlling data writing via the magnetic disk control circuit and the data transfer control circuit. 3. The memory circuit A further comprises means for counting and storing whether or not a correctable data error has occurred in the same cylinder / head and notifying the processor when a fixed count value is reached. The magnetic disk processing device described. 4. The memory circuit A comprises means for reading the cylinder / head address value to the processor in the count circuit, and when the processor is notified by the means, it is controlled by the processor to perform defect replacement processing. The magnetic disk processing apparatus according to claim 2, further comprising a defective substitute processing control circuit.