JPH04125850A - Disk controller - Google Patents

Abstract

PURPOSE:To check the omission of data or the generation of data by adding a check code to write data and reading and checking a code which is written and recorded in a disk. CONSTITUTION:A disk control part 29 writes data 220 on an interface part 50 into the disk 3. A processor 80 compares the check codes 380 and 390 of check code generation parts 40 and 70. When they coincide, the processor 80 reports normal termination to a processor 1-1. When they do not coincide, it reports the omission of data or the generation of data. When the processor 80 detects the dissidence of the codes which are read from the generation part 70 and the disk 3 at the time of reading data from the disk 3, it outputs a code error 420. When the processor 80 detects the error 420, it recognizes the omission of data or the generation of data in the disk 3 from the interface part 50 and reads route information 410 at the time of reading. When the error cannot be detected in the generation part 70, the processor 80 reads the codes 380 of the generation parts 70 and 40. When they coincide, it reports normal temination to the processor 1-1. When they do not coincide, the omission of data or the generation of data is reported to the processor 1-1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a computer system which is connected to N host processors and M disk controllers that control disks that record a plurality of files. The present invention relates to a disk control device having two directors, and particularly relates to a disk control device that records path information of write data on a 111r disk.

[Conventional technology]

When writing data transferred from a host processor to a disk device, a conventional disk control device uses a check code generated for the write data transferred from the host processor and a check code for the write data transferred to the disk device. It was designed to compare the check code generated for the Also, when reading data from a disk device, the check code generated for the data read from the disk device and the check code generated for the data transferred to the host processor are compared. Ta.

[Problems to be Solved by the Invention] In this conventional disk control device, by comparing the check code on the input side and the check code on the output side, the disk! +1# It is designed to check data gaps or data gaps inside the device, but there is a problem in that it is not possible to check data gaps or data gaps in the disk device.

Ninth, when multiple directors are connected to a disk device, if a data leak occurs when writing data, it is not possible to identify the director or disk control unit where the write was performed. There was an issue.

[Means to solve the problem]

The disk control device of the present invention is a disk control device having y directors interconnected to N host processors and y disk control units for controlling a disk on which a plurality of files are recorded. The director includes a host interface section that transfers write and read data to and from the disk with the host processor, and a host side that generates check codes for write and read data transferred by this host interface section. A disk interface section that transfers data between the check code generation section and the disk control section when writing and reading data to and from the disk, and a disk interface section that controls data transfer between the host interface section and the disk interface section. a data transfer control unit; a disk-specific check code generation unit that generates a check code for write and read data transferred by the disk interface unit; a microprocessor that controls writing and reading of data to and from the disk; A path information writing register that stores path information including a connection port number and a director number of the host interface section that are set by the microprocessor when writing data, and a check generated by the disk check code generation section. The code and the route information stored in the route information writing register are added to the data by the disk interface section, and the route information written in this record is added at 9 o'clock in the record written to the disk. It has a register for breaking route information ia to be stored.

[Effect]

In the present invention, a check code generated for write data transferred from a host processor is added to the write data and written to the disk, and when data is read, the check code recorded on the disk is read and checked.

Furthermore, route information indicating the data write route is added to the write data and written to the disk, and data omissions or data gaps are detected when reading data.

〔Example〕 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figure t41 is a block diagram showing an embodiment of the present invention.

In FIG. 1, 1-1.1-2 is a host processor, 2 is a disk controller having directors 10, 11, 12.13, and 3/! This is the disk playback section that controls the disks 4' that record the files of 20, 21, 22, and 23.

Then, 21JO=203 minutes and 210-213 two routes are shown, and 220-224'j? and 230-233
indicates data.

In this way, the host processor 1-1.1-2 and
The disk system # apparatus 2 connected to the disk 3 for recording a plurality of file storages and the disk control units 20 to 23 that control the disk 3 includes directors 10 to 13f.
It has t.

FIG. 2 is a block diagram showing an embodiment of the director 10 in FIG. #I1.

In FIG. 2, the same reference numerals as in FIG. 1 indicate corresponding parts. The director 1o also has a host interface unit 3 which performs a glance at the disk 3 and transfers read data to and from the host processor 1-1.1-2.
0, a host-side check code generation unit 4o that generates a check code for write and read data transferred by this host interface unit 30, and a disk 3.
A disk interface section 50 that writes data to and transfers data to and from the disk control section 20 at 9 o'clock tIt, and a host ink 7 m-, X section 3.
A data transfer control unit 60 that controls data transfer between 0 and the disk interface unit 50, and a data transfer control unit 60 that controls data transfer between the disk interface unit 50 and the writing and data transferred by the disk interface unit 50! ! a disk-side check code generation unit 7G that generates a check code for the data; and a microprocessor 80 that controls data writing and reading from the disk 3.
Host interface section 3 set by microprocessor 80 when writing data to disk 3
0C1! a route information writing register 90 for storing route information including a connected port number, a director number, etc.;
The check code generated by the disk side check code generation section 70 and the route information stored in the route information writing register 90 are added to the data by the disk interface section 50, and the record written on the disk 3 is read I#L. It consists of a route information reading register 100 that stores the route information written in this record at the time of transfer.

Next, the operation of the embodiment shown in FIG. 2 will be explained.

First, writing of data from the host processor 1-1 to the disk 3 will be explained.

The microprocessor 80 is connected to the host processor 1-1 via the host interface unit 30 (WRIT).
E) Command 300 k is defeated and post processor 1
The route 200 connected to -1 and the director number are stored in the route information writing register 90 as route information 320. Then, the host M//7-1-base unit 30 receives the write data transferred following the write command ``300'' and outputs it to the data transfer control unit 60 and the host-side check code generation unit 4G.Data transfer control* SO is the data 34 output from the host interface section 3o.
0 is output to the disk interface unit 5o.

* x ) 49 f x check code main generating section 40 d Generates a check code for the data 310 output from the host interface section 30 .

When outputting data to the disk 3, the disk interface unit 50 first outputs 1 byte of 5YNC bytes and the route information 3 stored in the route information write register 90.
30 as one byte, and then the data transferred from the data transfer control section 60 is output to the disk control section 20 and the disk side check code generation section TO. Then, the disk-side check code generation unit TO generates a check code for the data 36G transferred from the data transfer control unit 6° and output from the disk interface sso. When the data transfer from the disk interface section 50'' to the transfer control section 60 is completed, the 2-byte check code 370 generated by the disk side check code generation section To is sent to the acceptance/failure disk control section 20.

Disk control section 20 #i disk interface section 50
The 9 data 220 sent from the CPU 11 is written to the disk 3 as data 23G. When the writing to the disk 3 is completed, the microprocessor 8G compares the check code 380 generated by the host side check code generation unit 40 with the check code 390 generated by the disk side check code generation unit 70, and if they match, the host processor 1 -1 reports normal completion. If they do not match, data omission or data omission will occur within the disk control device, and this will be reported to the host processor 1-1.

Next, reading data from the disk 3 will be explained.

When the microprocessor 80 receives a read (READ) command from the host processor 1-1, the disk interface unit 50 reads the data 230 from the disk 3.
Data 220 read through the disk control unit 20
When the t-receiver weirs, the route information 4GG outputted following the SYNC byte is stored in the route information reading number register 100. Then, data output following this route information is output to the data transfer control section 60 and the disk-side check code generation section TO. The disk-side check code generation section TO generates a check code for the data 360 output from the disk interface section 50.

The data transfer control section 6G is the disk interface section 50.
The data 350 outputted from the host interface section 30 is transferred to the host interface section 30.

The host interface section 30 is a data transfer control section 60.
9 data 340 transferred from the host processor 1-1
At the same time, it is also output to the host-side check code generation unit 40. Host side check code generation [40 generates a check code for the data 310 output from the host interface unit 30. When the microprocessor 80 finishes reading data from the disk 3, it checks whether there is any abnormality in the read failure operation. When it is detected that the check code generated by the disk-side check code generation unit 10 and the check code read from the disk 3 do not match, the microprocessor 8
Outputs check code error 420 for 0. When the microprocessor 80 detects that the check code error 420 is about to be output from the disk side check code generation section 7G, it recognizes that data omission or data omission has occurred between the disk interface section 50 and the disk 30, Route information: 4 The write route information 410 stored in the read register 100 is read and reported to the host processor 1-1.

If no check code error is detected in the disk-side check code generation section TO, the microprocessor 80 sends the disk-side check code generation section TO
9 check code 39G generated by , and check code 380 generated by host side check code generation unit 40
t are read and compared, and if they match, a normal completion report is sent to the host processor 1-1. If there is a mismatch, data will be lost inside the disk controller! 19 reports to the host processor 1-1 that data leakage has occurred.

〔Effect of the invention〕

As explained above, the present invention adds a check code generated for write data transferred from a host processor to the write data and writes it to the disk, and when reading the data, reads and checks the check code recorded on the disk. By doing so, it is possible to check for data gaps or data gaps in the disk device.

In addition, path information indicating the data writing path is added to the written data and written to the disk, and if data omission or data omission is detected when reading data, if it occurs when writing data, the data is read from the disk. This has the effect of improving maintainability since it is possible to identify through which director the data was written (by route information).

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an embodiment of the director shown in FIG. 1-1, 1-2... host processor, 2...
Disk control device, 3... Disk, 10-13.
... Director, 20-23... Day 1211
Part 18, 30...Host interface part, 40-
@Ken Hoss) Nene check code generation department, 50...
Disk interface unit, 60...data transfer control unit, 10...disk quality check code generation unit,
80...Microprocessor, 90...Register for writing regular route information, 10G...Register for reading route information.

Claims (1)

[Claims] N (N: any natural number) host processors and M (M:
In a disk control device having M directors mutually connected to an arbitrary natural number (M>N) disk control units, the director has a system for transmitting write and read data to and from the disk with the host processor. between a host interface unit that performs transfer, a host-side check code generation unit that generates check codes for write and read data transferred by this host interface unit, and the disk control unit when writing and reading data to and from the disk. a disk interface unit that transfers data; a data transfer control unit that controls data transfer between the host interface unit and the disk interface unit; and a check code for write and read data transferred by the disk interface unit. A disk-side check code generation unit that generates a check code, a microprocessor that controls writing and reading of data to and from the disk, and a connection port number and a director number of the host interface unit that are set by the microprocessor when writing data to the disk. A route information writing register that stores route information consisting of the above, and a check code generated by the disk side check code generation unit and the route information stored in the route information writing register are converted into data by the disk interface unit. 1. A disk control device comprising: a path information reading register for storing path information written in an added record when reading the record written on the disk.