JPH04330513A - Disk controller for parallel transfer - Google Patents

Abstract

PURPOSE:To immediately detect a data error and to transfer correct data. CONSTITUTION:A serial number and a pass number are added at every byte of writing data and outputted to a sub-cotroller 7, the serial number and the pass number are counted up by an increment signal outputted at every data transfer of one byte and selective signals are outputted to N sub-controllers by decoding the pass number by a pass decoder 5. During the output of the selective signals from the pass decoder 5, the data for which the serial number and the pass number are added are transferred to/from a host interface control part, the transferred data are written and read out in/from a data buffer 17, the data read out from the buffer 17 are written in a disk device 11, and a serial number and a pass number are added at every byte of the data read out from the device 11, and the number-added data are written in the data buffer 17. At the time of distributing and connecting the data for parallel data transfer, the serial number and the pass number are checked.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk control device that includes a plurality of data buffers and performs parallel data transfer between a host processor and a plurality of disk devices.

0002

2. Description of the Related Art Conventionally, this type of disk control device has a host interface control unit and N data buffers for storing write data and read data, and parallel data processing is performed between a host processor and N disk devices. When transferring data, the host interface control unit transfers data to a designated subcontroller among the N subcontrollers.

0003

[Problems to be Solved by the Invention] In the conventional disk control device described above, the subcontrollers sequentially designated by the host interface control unit transfer data between them and the host interface control unit.
If the subcontrollers are not designated sequentially due to a failure or malfunction, or if data is transferred by mistake in the subcontrollers, data errors may occur during distribution or combination.

0004

[Means for Solving the Problems] A disk control device for parallel transfer according to the present invention includes means for adding a serial number and a pass number to each byte of write data, and means for decoding this pass number to select a subcontroller. a means for outputting a selection signal for decoding the serial number, a means for decoding the serial number and distributing the write data for each file, and a means for decoding the serial number and distributing the write data for each file, and an increment signal output for each 1-byte data transfer. means for comparing the serial number and pass number respectively, means for combining the read data using the serial number and pass number added to each byte of read data, and the serial number and pass number created by the increment signal output in this read operation. It has means for comparing the pass number, the serial number added to the read data, and the pass number, respectively.

[0005]

[Operation] The present invention can reliably detect data errors when distributing and combining data during data transfer.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of a disk control device for parallel transfer according to the present invention. In the figure, 1 is a host processor, 2 is this host processor 1
This host processor 1 controls data transfer between
A host interface control unit adds a serial number and a pass number to each byte of write data transferred from the controller and transfers it to the following subcontroller. 3 is a channel command output from the host processor 1 via this host interface control unit 2. A microprocessor 4 receives the data, controls writing and reading of data to and from the disk device described below, and reports completion to the host processor 1 via the host interface control unit 2. 4 is the host interface control unit 2 and the following subcontrollers. 5 is a serial/pass counter that counts the serial number and pass number using an increment signal that is output every time 1 byte of data is transferred. 5 decodes the pass number that is output from this serial/pass counter. , is a path decoder that outputs selection signals to the following four sub-controllers.

Reference numeral 6 denotes a serial/pass number which compares the serial number and pass number output from the host interface control section 2 with the serial number and pass number output from the serial/pass counter 4 when reading data from the disk device described below. Pass number comparison section, 7, 8, 9 and 10
11, 12, 13 and 14 are subcontrollers 7, 8, 9 and 1, respectively, which write and read data to and from the following disk devices.
This is a disk device that is connected to 0 and stores files. Note that the disk control device 15 is composed of the above-mentioned host interface control section 2, microprocessor 3, serial/pass counter 4, pass decoder 5, serial/pass number comparison section 6, and subcontrollers 7, 8, 9, and 10. In this embodiment, four subcontrollers each connected to four disk devices are provided. Further, FIG. 2 is a diagram showing the distribution of write data transferred from the host processor 1 from the host interface control section 2 to the subcontrollers 7 to 10.

Further, the sub-controllers 7, 8, 9 and 10 have the same configuration, and the detailed configuration is shown in sub-controller 7. In this sub-controller 7,
16 transfers data to and from the host interface control unit 2 to which a serial number and a pass number are added when the selection signal is output from the path decoder 5, and writes and reads data to and from the data buffer described below. 17 is a data buffer that stores write data and read data for the disk device 11; 18 is a data buffer that controls writing of data read from the data buffer 17 to the disk device 11; Add a serial number and pass number to each byte of read data and write it to data buffer 1.
A disk control unit 19 controls writing to the host interface control unit 2 and the data transfer control unit 16, and counts a serial number every time 1 byte is transferred during data transfer between the host interface control unit 2 and the data transfer control unit 16. In other words, when writing data, The serial number is counted by the increment signal 44 output from the data transfer control unit 16, and the serial number is counted every time 1 byte is transferred during data transfer between the disk control unit 18 and the disk device 11. In other words, the serial number is A sub-serial counter counts the serial number using an increment signal 47 output from the disk controller 18 when reading the sub-controller 7. Reference numeral 20 is an address switch that outputs an address indicating the pass number of the sub-controller 7. Reference numeral 21 denotes a sub-comparison that compares the serial number and pass number output from the data transfer control unit 16 with the serial number output from the sub-serial counter 19 and the address output from the address switch 20 when writing data is stored in the data buffer 17. Department.

Next, the operation of the parallel transfer disk control device having the above configuration will be explained. First, the host interface control unit 2 receives the serial number and pass number 2 output from the serial/pass counter 4 for each byte with respect to the write data 22 transferred from the host processor 1.
After outputting data 30 to which 7 has been added, an increment signal 25 is output to the serial counter 4. This serial/pass counter 4 increments the pass number by 1 when the increment signal 25 is output from the host interface control unit 2, and sets this pass number to "0" when the increment signal 25 is output when the pass number is "3". ,
Set the serial number to +1. Then, the path decoder 5 outputs the path number 2 from the serial/pass counter 4.
8 is decoded, and when the path number is "0", the selection signal 33
is output, and when the pass number is incremented, selection signals 33, 34, 35 and 36 are output in sequence. and,
The data transfer control unit 16 outputs the response signal 32 only when the selection signal 33 is input, receives the data 30 to which the serial number and the pass number are added, stores it in the data buffer 17, and outputs the increment signal 44. Output to sub-serial counter 19.

[0010] Then, the sub-comparison section 21 compares the data 30 to which the serial number and pass number have been added with the serial number 42 output from the sub-serial counter 19 and the address 43 output from the address switch 20. Here, the serial number added to the data is compared with the serial number 42 output from the sub-serial counter 19, and the pass number added to the data is compared with the address 43 output from the address switch 20. and,
The sub comparison section 21 compares the serial number and the pass number, and outputs a mismatch signal 37 to the microprocessor 3 if a mismatch is detected. Then, the disk control unit 18 writes only the read data 50 of the write data 48 to which the serial number and pass number are added from the data buffer 17 to the disk device 11. In this way, when the selection signals 33, 34, 35 and 36 are output from the path decoder 5, the sub-controllers 7, 8, 9 and 10 have the serial number and path number output from the host interface control unit 2 added. It is possible to receive data 30 and write only data 50, 51, 52 and 53 to disk devices 11, 12, 13 and 14, respectively.

Next, the operation of reading data from the disk devices 11, 12, 13 and 14 will be explained. First, in FIG. 2, data is combined in the opposite direction to distribution. Subcontrollers 7, 8, 9 and 10 read data 50, 51, 52 and 53 from disk devices 11, 12, 13 and 14, respectively. First, to explain the sub-controller 7, the disk control unit 18 outputs a serial number 46 from the sub-serial counter 19 for each byte of data 50 read from the disk device 11 and an address 49 indicating a pass number output from the address switch 20. The data 48 to which is added is stored in the data buffer 17, and an increment signal 47 is output to the sub-serial counter 19.

This sub-serial counter 19 increments the serial number by 1 when an increment signal 47 is output from the disk control section 18. When reading data, the sub comparison section 21 does not operate, and the data transfer control section 16 does not output the increment signal 44 to the sub serial counter 19. Then, this data transfer control unit 16 reads data 45 to which a serial number and a path number are added from the data buffer 17, and the path decoder 5 outputs a selection signal 33 and the host interface control unit 2 outputs a request signal 31. When a serial number and a pass number are added, data 30 is outputted, a response signal 32 is outputted, and the data 30 is transferred to the host interface control unit 2. When this host interface control unit 2 receives data 30 with serial numbers and pass numbers added from subcontrollers 7, 8, 9, and 10, it
After the serial number and pass number 24 are output to the serial/pass number comparator 6, an increment signal 25 is output to the serial/pass counter 4. This serial/pass number comparison unit 6 compares the serial number and pass number 24 output from the host interface control unit 2 with the serial number and pass number 26 output from the serial/pass counter 4,
If a mismatch occurs, a mismatch signal 29 to the microprocessor 3 is output.

When the comparison operation in the serial/pass number comparator 6 is completed, the serial/pass counter 4 counts the pass number and serial number based on the increment signal 25 output from the host interface controller 2. In this way, the microprocessor 3 receives the discrepancy signal from the serial/pass number comparator 6 or the subcontrollers 7, 8,
If any one of the mismatch signals from 9 and 10 is output, an error report can be made to the host processor 1 via the host interface control section 2. In addition, although the above-mentioned example showed the case where four sub-controllers were provided, it is needless to say that it is not limited to this, and the same effect can be achieved even if N sub-controllers are provided.

[0014]

As described above in detail, according to the disk control device for parallel transfer according to the present invention, when writing data, the host interface control section transfers data to which serial numbers and path numbers have been added to a plurality of subcontrollers. This distributed data is then checked for serial number and pass number in each sub-controller.
On the other hand, when reading data, the host interface control unit checks the serial number and pass number of the combined data to which multiple subcontrollers have added serial numbers and pass numbers, thereby distributing and combining data during parallel data transfer. This has the effect of being able to detect data errors.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a parallel transfer disk control device according to the present invention.

FIG. 2 is a diagram showing distribution of write data transferred from the host processor of FIG. 1 from a host interface control unit to a subcontroller.

[Explanation of symbols]

1 Host processor 2 Host interface control unit 3. Microprocessor 4 Serial/pass counter 5 Path decoder 6 Serial/pass number comparison section 7-10 Sub controller 11-14 Disk device 15 Disk control device 16 Data transfer control unit 17 Data buffer 18 Disk control section 19 Sub-serial counter 20 Address switch 21 Sub comparison section

Claims (1)

[Claims] 1. A disk control device that has a host interface control unit and N data buffers for storing write data and read data, and that transfers parallel data between a host processor and N disk devices. A means for adding and outputting a serial number and a pass number to each byte of data, a means for decoding the pass number and outputting a selection signal for selecting a subcontroller, and a means for decoding the serial number and outputting write data for each file. means for distributing the data to the data, means for comparing the serial number and pass number created by the increment signal output every byte of data with the serial number and pass number added to the write data, Means for combining read data using the added serial number and pass number, and means for comparing the serial number and pass number created by the increment signal output in this read operation with the serial number and pass number added to the read data, respectively. What is claimed is: 1. A disk control device for parallel transfer, characterized in that it is made up of: and is capable of detecting errors in distribution and combined data during parallel data transfer.