JPH0668719B2 - Peripheral control device - Google Patents

Description

The present invention relates to a peripheral control device, and more particularly to a peripheral control device of a type in which a controlled device is shared by a plurality of peripheral control devices.

[Prior Art] Generally, in order to improve performance and reliability, this type of peripheral control device has a device cross-call configuration in which a plurality of peripheral control devices share a controlled device such as a magnetic disk device or a magnetic tape device with each other. Has a function that enables In the device cross-call configuration, the host system selects the one with the lightest load from the two peripheral control devices,
Access the desired controlled device.

Conventionally, this type of peripheral control device does not have a means for storing statistical information about the controlled device independently and referencing it from other peripheral control devices sharing the controlled device. Alternatively, the statistical information aggregated for each peripheral control device is not displayed separately, but the value obtained by summing the statistical information of the peripheral control devices sharing the controlled device is reported and displayed to the higher-level device.

[Problems to be Solved by the Invention] In the above-mentioned conventional peripheral control device, when statistical information is stored independently, the host system shares it in order to obtain statistical information regarding a desired controlled device. Had to make an individual request to each peripheral controller that was running. Further, when the statistical information is integrated, there is a problem that the statistical information for each path including the peripheral control device cannot be obtained and it is difficult to analyze a failure depending on this path.

The present invention provides a peripheral control device that solves the above problems of the conventional one.

[Means for Solving the Problems]

According to the present invention, in the peripheral control device having the function of controlling the shared control of the controlled device by connecting with the peripheral control device of the other system, the means for storing the statistical information of each controlled device and the peripheral control device of the own system Means for referencing and initializing statistical information in the storing means for the peripheral control devices of the other system connected thereto, and respective statistical information in the storing means of the peripheral control devices of the own system and the other system. A peripheral control device is obtained which has means for simultaneously and separately reporting to a host device.

〔Example〕

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a magnetic tape subsystem which is an embodiment of the present invention.

The magnetic tape controller (hereinafter MTC) 1 includes a host connection unit (hereinafter CHA) 10 and a device connection unit (hereinafter MTA) 1.
A host machine 2 and a plurality of magnetic tape units (hereinafter referred to as MTUs) 3 are connected to each other via 1. Each MTU 3 is connected so as to be shared by the two MTCs 1.

The data buffer 12 of the MTC 1 is divided corresponding to each MTU 3, temporarily stores the data transferred between the CHA 10 and the MTA 11, and enables the CHA 10 and the MTA 11 to operate asynchronously. Microprocessor 13 is MTC
1 controls each part. The control information storage unit 14 stores various kinds of information including control information of the microprocessor 13. The statistical information storage unit 15 stores statistical information regarding the READ / WRITE operation for each MTU 3.

The data of the statistical information storage unit 15 can be mutually updated by the microprocessor 13 of the MTC 1 of the other system connected thereto. That is, when the data is updated from the microprocessor 13, the data of the other party are also updated at the same time.

After the processing requested by the host machine 2 is completed, the status storage unit 16 temporarily stores the status or statistical information edited by the microprocessor 13 as the execution result, and sends it to the host machine 2 via the CHA 10. To do.

FIG. 2 shows the statistical information stored in the statistical information storage unit 15 in FIG. A system information 101 is A system MTC
1 is statistical information related to the processing performed by the B-system MTC 1, and the B-system statistical information 102 indicates statistical information related to the processing performed by the B-system MTC 1. Each MTU3 to be controlled is divided, and the statistical information for one MTU is A
It is included in the system statistical information 101 and the B system statistical information 102.

Next, the operation of the apparatus of this embodiment will be described with reference to the drawings.

The microprocessor 13 shown in FIG. 1 controls each part in the MTC 1 by a micro program, and particularly for the READ command and the WRITE command from the host machine 2, C
HA10, MTA11, and data buffer 12 are controlled to read data from MTU3 (READ), MT
Write data to U3. This READ
Microprocessor 13 performs READ / WRITE for each / WRITE processing
The number of processing blocks, the number of data error occurrences, the number of successful data automatic corrections, the number of successful automatic retries, etc. are counted, and the data in the statistical information storage unit 15 is updated. When processing is performed from the A-system MTC1 to an arbitrary MTU3, the microprocessor 13 of the A-system MTC1
Is the A system statistical information 1 of the statistical information storage unit 15 in FIG.
The data regarding the MTU3 in 01 is updated.

At this time, the A-system statistical information 101 in the A-system and B-system statistical information storage units 15 is updated at the same time, and the contents are the same. Similarly, an arbitrary MT is set by the B system MTC1.
When U3 is processed, the B system statistical information 102 in the A and B system statistical information storage units 15 is updated.

When the host machine 2 needs statistical information for an arbitrary MTU3, the RE for the MTC1 of either system A or system B is required.
Send the AD LOGGING command.

Now, if a command is issued to MTC1 of A system, A
The system microprocessor 13 is the A system statistical information storage unit 1.
5, the statistical information regarding the MTU 3 is read from both the A-system statistical information 101 and the B-system statistical information 102 and stored in the status storage unit 16. The host connection unit 10 sends the statistical information stored in the status storage unit 16 to the host machine 2 according to an instruction from the microprocessor 13. When the transmission of the statistical information is completed, the microprocessor 13 initializes all the statistical information regarding the MTU 3 stored in the statistical information storage unit 15 of the A system and the B system.

As a result, the host machine 2 sends A regarding the MTU 3 concerned.
It is possible to collect and initialize the statistical information in both the MTC1 of the system and the B system by one access, and collect and initialize from any MTC1 without being aware of the access path.

〔The invention's effect〕

As described above, according to the present invention, in a peripheral control device that shares a controlled device, statistical information regarding each controlled device is individually counted for each peripheral control device that controls the controlled device, and when requested by a host system, By reporting the statistical information edited for each peripheral controller, the load on the higher-level system for collecting statistical information can be reduced and the data on the operating status of each access path including the peripheral controller can be collected, which is a problem. There is an effect that the analysis and preventive maintenance can be performed accurately.

[Brief description of drawings]

FIG. 1 is a block diagram of an example of a magnetic tape controller according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of types and forms of information stored in the statistical information storage unit 15 shown in FIG. . Explanation of symbols: 1 ... magnetic tape controller, 2 ... host machine, 3 ... magnetic tape device, 10 ... host connection part, 11 ... device connection part, 12 ... data buffer, 13 ... microprocessor , 14 ... Control information storage unit, 15 ... Statistical information storage unit, 16 ... Status storage unit, 101 ... A system statistical information, 102 ... B system statistical information.

Claims (1)

[Claims] 1. In a peripheral control device which is connected to a peripheral control device of another system and controls shared control of a controlled device, a means for storing statistical information of each controlled device and the connection from the peripheral control device of its own system. Means for referencing and initializing the statistical information in the storing means for the peripheral control device of the other system, and the statistical information in the storing means of the peripheral control devices of the own system and the other system simultaneously and A peripheral control device having means for classifying and reporting to a host device.