JPS62256047A - Spurious fault generating system - Google Patents

Abstract

PURPOSE:To enable a spurious fault to be reset at an optional time in the process of a retrying process, and a detailed evaluation of the retrying process, by permitting the designation of the generating number of times of the spurious fault. CONSTITUTION:The program executes an expanded decor instruction based on a physical channel exceptional data. A spurious fault setting data is embedded in a firmware within an input/output control device 4 by the instruction, and simultaneously, a spurious fault generation counter 41 is zero-cleared, but in the state, a physical channel exception is not generated. Afterwards, when a control is handed to an operating system, and a channel command is executed for the data write request from another application job to a peripheral device 61 at an access bus, the value of the spurious fault generation counter 41 is compared with the designated number of times of the generation of the spurious fault, and when they coincide, no spurious fault is generated, and an input/output operation is terminated normally.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides an arithmetic processing device, an input/output control device connected to the arithmetic processing device, and a main storage device connected to the arithmetic processing device. The present invention relates to a pseudo-failure generation method used in an information processing system including, in particular, a pseudo-failure generation method for an input/output control device.

[Conventional technology]

Conventionally, with this type of pseudo-failure generation method, it has been impossible to specify the number of occurrences and cause a pseudo-fault to occur.

[Problem that the invention seeks to solve]

In the above-mentioned conventional pseudo-failure generation method for input/output control devices, even if input/output operations are performed on the same channel again, the same pseudo-failure will permanently occur, and the operation will end normally. The drawback is that successful processing cannot be evaluated.

Means for Solving Problem c] The pseudo-failure generation method of the present invention is stored in the main storage device and includes designation information of the input/output control unit number, physical channel number, logical channel number, and number of pseudo-failure occurrences. pseudo-fault setting means for setting pseudo-fault setting data and pseudo-fault information included in the pseudo-fault setting data in an input/output control device; means for storing the number of times the pseudo-fault has occurred; means for comparing the number of input/output operations to a channel having a control device number, a physical channel number, and a logical channel number with the set number of pseudo failure occurrences; It has means for generating the pseudo failure.

Therefore, at any point during the retry process.

Pseudo failures can be reset and retry processing can be evaluated in detail.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an information processing system to which the pseudo fault generation method of the present invention is applied.

Main storage device 1. Arithmetic processing unit 3. The input/output control device 4 is connected to the system control device 2, the peripheral control device 5 is connected to the input/output control device 4, and the peripheral devices 131, 82°, . . . , 6n are connected to the peripheral control device 5. Pseudo failure setting data stored in main storage device 1! 1 has a pseudo failure information designation area 01. Further, the input/output control device 4 has a pseudo failure occurrence counter 41.

Figure 2 shows a part of a successful retry flow in which a failure occurs due to a pseudo failure program (not shown) stored in the main memory shown in Figure 1, and the second access ends normally. It is a diagram.

Now, the input/output controller number is "Q" and the physical channel number is "l".
'', a case will be considered in which a physical channel exception is caused by accessing the peripheral device 61 having the logical channel number rlJ. Operating system (not shown) (hereinafter referred to as
The pseudo-failure generation program that is started as one job under (abbreviated as O8) is
For 1, specify the pseudo failure type as a physical channel exception,
Furthermore, the input/output control device number "O" and the physical channel number "
l”, logical channel number “1”.

Write the number of pseudo failure occurrences “l” (process 21) 0 Next,
This program executes an extended decall instruction based on this physical channel exception data (processing 22), and this instruction embeds pseudo failure setting data in the firmware in the input/output control device 4 (processing 23). , At the same time, the pseudo failure occurrence counter 41 is cleared to zero. (
Process 20: In this state, no physical channel exception occurs.

Control then passes to the O5 and another application
When a channel command is executed on the access bus in response to a data write request from the bus to the peripheral device 81 (process 25), the pseudo failure occurrence counter 4! Process the value of 2
Processing 2 compared to the specified number of pseudo failure occurrences set in 1.
B), since it is smaller than this, a physical channel exception will occur; process 27), and the pseudo failure occurrence counter 41 is incremented by l'' (process 28).

Since the input/output operation has ended abnormally, O5 accesses the same channel again (process 29).

Compare the value of the pseudo-failure information counter 41 and the designated number of pseudo-failure occurrences set in process 21 (process 30), and as the result becomes equal, no pseudo-failure occurs and the input/output operation ends normally (process 31); Similarly, if the number of pseudo failure occurrences of n times is specified in process 21, n pseudo failures will occur during n input/output operations, and input/output operations will not end normally from the (n+1)th time onward. It is easy to make an analogy.

[Effects of the Invention] As explained above, the present invention allows the pseudo failure to be reset at any point in the retry processing process by allowing the number of pseudo failure occurrences to be specified. It has the effect of allowing evaluation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an information processing system to which the pseudo failure generation method of the present invention is applied, and FIG. 2 is a diagram showing a part of the flow of a successful retry. 1... Main storage device, 2... System control device. 3... Arithmetic processing device, 4... Input/output control device, 5
...Peripheral control device, 81-6n...Peripheral device,
11... Pseudo fault setting data, 111... Pseudo fault information specification area. 41...Pseudo failure occurrence counter. Jl'! Figure 1

Claims (1)

[Scope of Claims] An information processing system including an arithmetic processing device, an input/output control device connected to the arithmetic processing device, and a main storage device connected to the arithmetic processing device, comprising: The simulated failure setting data that is stored in the input/output control unit and includes designation information of the input/output control unit number, physical channel number, logical channel number, and number of simulated failure occurrences, and the simulated failure information included in the simulated failure setting data are sent to the input/output control unit. a pseudo-fault setting means for setting; a means for storing the number of times the pseudo-fault has occurred; and setting the number of input/output operations to a channel having the specified input/output control device number, physical channel number, and logical channel number. and means for generating the pseudo fault set in the input/output control device based on the comparison result.