JP2629554B2 - Information processing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing system and, more particularly, to a failure processing method for performing recovery processing of a failure occurring in a channel.

[0002]

2. Description of the Related Art Conventionally, when a channel exception occurs in an information processing system (here, a channel exception means
Events that affect the operational state of the channel, that is,
(This indicates a failure of a channel or a failure of an interface inserted between a channel and a device.) For example, the occurrence of a channel exception in the channel is reported from the I / O controller to the central processing unit. And
A recovery process is executed by an operating system (hereinafter referred to as an OS), and an attempt is made to re-install the channel (for example, JP-A-63-75847).

[0003]

By the way, in the case of the conventional channel exception recovery processing, the recovery processing of the channel is performed by the OS irrespective of the failure that caused the channel exception. If the failure is a fixed failure of the hardware gate of the channel or the like, an attempt to re-install the OS will always fail. In other words, even in the case of a fixed failure of the hardware gate, useless recovery processing of the channel is performed due to the reintegration attempt, and as a result, the I / O load increases. There is a problem.

[0004] An object of the present invention is to provide an information processing system in which the I / O load does not increase.

[0005]

According to the present invention, a central processing unit, an input / output control unit connected to the central processing unit for controlling a plurality of subordinate channels, and a device connected to each of the channels are provided. And a memory device for transferring data to and from each of the devices, and channel exception detecting means provided in each of the channels and detecting, as a channel exception, occurrence of an event affecting the operable state of the channel. In the system, the input / output control device includes a diagnostic operation control unit that performs a diagnostic operation for verifying whether the channel exception is a fixed failure of a hardware gate of the channel when the channel exception occurs. First notifying means for notifying the central processing unit of a channel exception when a fixed fault is detected by the diagnostic operation; When an I / O instruction for activating an input / output operation is issued to a channel detected as a fixed fault by the diagnostic operation control means, the channel is unconditionally executed without executing the I / O instruction. And a second notifying means for notifying the central processing unit of an end report by adding a condition code indicating that the device is inoperable.

[0006]

Next, the present invention will be described by way of examples.

Referring to FIG. 1, the illustrated information processing system includes a central processing unit 1, an input / output control unit 2 connected to the central processing unit 1, and an input / output control unit 2 connected to the input / output control unit 2. N (n is an integer of 2 or more) channels 31 to 3n to be controlled, n devices 41 to 4n respectively connected to the channels 31 to 3n, the central processing unit 1 and the input / output control unit 2. And a connected memory device 5.

In each of the channels 31 to 3n, a channel exception detecting means for detecting an event which affects the operable state of the channel, that is, a fault of the channel or a fault of an interface located between the channel and the devices 41 to 4n. 311 to 31n are provided. The input / output control device 2 is activated by the channel exception detection by the channel exception detection units 311 to 31n, and performs a diagnosis operation control unit 21 (that is, a diagnosis operation control unit 21 that performs a diagnosis operation for verifying the validity of the hardware gate of the channel for each channel) When the channel exception occurs, the diagnostic operation control unit 21 determines the type of the failure as to whether the failure is a fixed failure), and the diagnostic operation by the diagnostic operation control unit 21 determines that the hardware gate of the channel is valid. A channel fixed fault notifying means 2 for notifying the central processing unit 1 of the occurrence of a channel exception when the lack is detected.
2 are provided.

As described above, when a channel exception occurs, the diagnostic operation control unit 21 performs a diagnostic operation on the channel, and attempts to verify the correctness of the hardware gate.

Further, after the occurrence of a channel exception, an I / O for activating an input / output operation for a channel in which a fixed fault of the channel is detected by the diagnosis by the diagnosis operation control means 21.
When the instruction is issued, the inoperable end report notifying means 23 unconditionally indicates that the channel is inoperable without executing the I / O instruction.
The end report is sent to the central processing unit 1 with the code added.
By notifying the end report in this manner, I / O is performed for a channel in which a fixed failure has occurred and recovery is not expected.
The end report can be notified as an inoperative channel without unnecessary execution of the O instruction.

[0011]

As described above, according to the present invention, when a channel exception occurs, the type of failure is determined to determine whether or not the failure is a fixed failure. Useless recovery processing can be omitted, and as a result, there is an effect that the I / O load expended on the recovery processing can be reduced and a reliable recovery processing can be executed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of an information processing system according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 central processing unit 2 input / output control device 31-3 n channel 41-4 n device 5 memory device 21 diagnostic operation control means 22 channel fixed failure notification means 23 inoperable end report notification means 311-31 n channel exception detection means

Claims (1)

(57) [Claims] A central processing unit, an input / output control unit connected to the central processing unit for controlling a plurality of subordinate channels, a device connected to each of the channels,
An information processing system comprising: a memory device for performing data transfer with each of the devices; and a channel exception detecting unit provided in each of the channels and detecting, as a channel exception, occurrence of an event that affects an operable state of the channel. A diagnostic operation control unit for performing a diagnostic operation for verifying whether or not the channel exception is a fixed failure of a hardware gate of the channel when the channel exception occurs; The first notifying means for notifying the central processing unit of the exception of the channel when a fixed fault is detected by the CPU, and an input to the channel detected as a fixed fault by the diagnostic operation control means. When an I / O instruction for activating an output operation is issued, the channel is unconditionally disabled without executing the I / O instruction. The information processing system characterized by the second notification means for adding the condition code for instructing to notify the completion report to said central processing unit is provided that is.