JPS60124763A - Input/output controller - Google Patents

Abstract

PURPOSE:To reduce generation of secondary fault and also to collect sufficient error information by providing a storage means stacking a command received from a channel device to attain the response of end of command reception even during the collection of the fault information. CONSTITUTION:When a fault in a processing unit is detected by a fault detector 14, a processing intermission latch 13 is set and the processing unit intermits the processing until the collection of fault information of the service processor is finished. After a sub-channel address and a command are stored tentatively in an address register 1 and a command register 2 during the intermission of this processing, they are stored in a command storage section 8 designated by a write pointer 6. A command reception end state word stored fixedly in a command reception end state word fixed storage section 12 after that is set to a state word register 10 via a selector 11 and responded to a channel device through a state word output bus 105. Generation of the secondary fault is reduced by providing a storage section 8 or the like in this way and fault information is collected sufficiently.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an input/output control device, and in particular, when a failure occurs in the device, failure information is collected by an attached device that collects failure information. It relates to input/output control devices.

[Background of the invention]

Some recent data processing devices such as large-scale electronic computers are equipped with an independent device that collects failure information when a failure occurs. The device with this fault information collection function is called a monitoring device or service processor (hereinafter referred to as SVP).
(abbreviated as essor).

By the way, an input/output device iti or an input/output control device is connected to such a data processing device via the channel device. For example, a 1171I device such as a disk control device or a communication control device has a data processing capacity comparable to that of a computer, and in that sense can be called a type of data processing device. From the perspective of being connected to a higher-level device through a device, it falls under the category of an input/output control device, and hereinafter all control devices connected to a higher-level device through a channel device are referred to as input/output control devices. I will handle the call.

Now, even in such a complicated input/output control device, it is necessary to have an SVP or SVP function for collecting fault information.
There is a tendency to have A01. The SVP function for the input/output control device will be specifically explained below using the drawings.

Figure 1 shows eight dedicated processing units and input/output control units.
It is a block diagram which shows the structural example in the case of providing VP. The processing device 21 is a higher-level data processing device, the communication control device 26 is a device that controls data transfer between the processing device 21 and the terminal device 24, and the channel device 22 is a device that controls the communication control device 26 as the processing device 2.
1, the terminal device 24 is a terminal device controlled by this communication decoration @25. 5V
P25 is an S dedicated to collecting failure information of the processing device 21.
It is VP. The processing unit 261 includes the channel device 22
This is a part that controls the transfer of human output data between the terminal device 24 and the processing device #21 under the control of commands given from the processing device 21 via the processing device #21. The SVPg32 is an SVP mechanism or device provided independently of the processing unit 231. When a failure occurs, the processing unit 261 interrupts processing, freezes the internal state, and returns the S V P 232
requests collection of failure information. and processing unit 26
1 restarts the process when the collection operation by the 5VP 232 is completed. Note that the above configuration is an example in which the communication control device has only one processing unit 261, but in order to increase the processing capacity of the communication control device 26, two or more processing units may be provided to perform processing in parallel. It's okay. In this case, one SVP 232 would service all of these processing units.

FIG. 2 is a configuration diagram showing an example of a configuration in which a processing device and an input/output control device share one SVP. The device 30 is an overall device that includes a processing device 1t21', a channel device 22', a communication control device 26', and a disk control device 26. The processing device 21' is a higher-level data processing device having the same function as the processing device 21, and is a channel device 2.
2' is a channel device similar to the channel device 22, a processing unit) 231', and a communication control device 23' is
A built-in communication control device and disk control device 26 having the same function as the g control device 23 is a device that controls data transfer between the processing device 21' and the disk device 27, and the disk device 27 is controlled by this disk control device 26. It is a device that The SVP 25' is an SVP that provides services to the processing device 21', the communication control device 23', and the disk control device 26.

Looking at the SVP service for the input/output control device as described above, when a failure occurs in the processing units 231, 231' or the disk control device 26, the SVP 2
5/) Ruiha S VP 25' c7) Gathering work! Processing in these input/output control devices cannot be restarted until the end of the process. When these input/output control devices receive a command from the channel device 22.22', if normal, they return an acceptance completion response to the channel device 22.22' (for example, in the case of a well-known data processing device, the processing (will return condition code = 0 to the device). However, if the input/output control device is interrupted by the above-mentioned fruit picking operation,
Either no response is returned, or a response indicating that command acceptance is pending is returned (for example, condition code -1 is returned to the data processing device). The processing devices 21 and 21' side monitors the time until the response returns and the time from receiving the command acceptance pending response until receiving the acceptance completion response, so if the above processing interruption time is long, either In this case, a timeout occurs and the input/output control device is treated as a permanent failure, causing a secondary failure in addition to the initial failure.

The above problem occurs when one SVP services multiple processing units, or multiple input/output control devices or processing devices.
If a failure occurs in two or more processing units or two or more input/output control devices/processing devices at the same time, c! Become a writer. That is, in this case, the SV performed on the music processing unit, the input/output control device, or the processing device
It is clear that the own processing interruption time is further extended due to the influence of P's collection operation.

[Purpose of the invention]

An object of the present invention is to provide a busy input/output control device that responds with command acceptance completion even while collecting fault information.

[Summary of the invention]

The present invention provides a storage means for stacking commands received from a channel device when processing is interrupted due to the occurrence of a fault, and sequentially stores # commands in the storage means while processing is interrupted due to failure information, and also stores the commands Let q″j be an input/output control device that returns an acceptance completion response to each of the following.

[Embodiments of the invention]

An embodiment of the present invention will be described below.

6 is a block diagram of the parts related to the present invention in the processing unit in the human output control device ff that controls the transfer of input/output data based on commands issued by the channel device. In (8), 1 is an address register that temporarily stores the subchannel address sent from the channel device through the 101 address input bus, and 2 is an address register that temporarily stores the subchannel address sent from the channel device through the 101 address input bus.
When there is no command sent through the command input bus (hereinafter referred to as normal time), the outputs of 1 and 2 are 6, respectively.
It is sent to the processing control unit 5 through the selector 4, the address bus 103, and the command bus 104, and is subjected to command activation processing.

The processing control unit 5 sets a status word indicating completion of command acceptance in the status word register 1o through the selector 11, and responds to the channel device through the status word output bus 105. This command activation process is generally described except for passing through selectors 6, 4, and 11, and the explanation beyond C is omitted here.

Next, the operation in FIG. 3 when a failure occurs will be explained. When a fault in the processing unit is detected by the fault detector 14, the processing interrupt latch 13 is set, and the failure information collection of the SVP is completed and the collection completion signal 10 (S) is issued and the processing of 13 is interrupted. Until the latch is reset, the processing unit suspends processing to allow sufficient fault information to be collected.During this suspension of processing, each subchannel address and command issued by the channel device is After address register 1 and command register 2 are temporarily stored,
80 is stored in the storage area of the command storage section specified by the write pointer No. 6. After this storage, the command acceptance completion status word fixedly stored in the 120 command acceptance completion status word fixed storage section is set in the status word register 10 through the selector 11, and is channeled through the status 1 backword output bus 105. answered by the device. Channel device u can issue the next command by receiving the status word indicating completion of command acceptance. Incidentally, when the storage of 80 commands in the storage unit is completed, the ill-included pointer of 6 is changed.
be done.

Now, when the next command is issued to the unit shown in Figure 1 while processing is suspended, the same processing as before is carried out and the address register 1 and 2 are
After being temporarily stored in the command register 80, the command and subchannel address are stored in the command storage section 80, and a command acceptance completion status word is set in the status word register 10 to respond to the channel device. Here, the command-included pointer of 6 is
It is updated every time one set of subchannel address and command is stored, and the storage capacity of these eight command storage units is as follows:
Since the commands issued by the channel device during the maximum processing interruption time are counted, previously stored subchannel addresses and commands will not be erased.

Next, the operation after SVP failure information collection is completed will be described. When the fruit picking completion signal 106 is issued from S and VP and the processing interruption latch 13 is reset, the processing control section 5 resumes processing, but at this time, the
The output of the read pointer 7, which is set to the value when the processing interruption of the 0d write pointer started, and the output of the write pointer 6 are compared by the pointer comparator 9.
When the values do not match (that is, this is a state in which the unprocessed subchannel address and command in the processing control unit 5 are stored in the command storage unit 8), and the selectors 3 and 4 are in a state where the unprocessed subchannel address and command are stored in the command storage unit 8. Selecting the output of the storage unit, the processing control unit 5
The subchannel address and command in the storage section 9a of the 80 command storage section specified by the read pointer 7 are received through the address bus 106 and the command bus 104, respectively, and are used for command activation processing. However, since the command obtained from the command storage unit 80 has already responded with the status word, the processing control unit 5 can answer the following questions: While the pointer comparator output of shows a mismatch,
The state word response behavior f in the command activation process is suppressed.

Sequentially, in the same way, pointer comparators 9 detect a match (
In other words, this means that the unprocessed subchannel address and command in the processing control unit 5 are not stored in the 80 command storage unit. Each time the command activation process is completed, the read pointer 7 is updated while the command activation process for the command obtained from the command storage unit 80 is performed. In addition, until the command activation processing of the command in this storage unit is completed, the command issued from the channel device is processed in response in the same procedure as when a failure occurs, and is stored in the 80 command storage unit and stored in the storage unit. 5 processing 1if in a shorter time than the time interval of commands issued from the channel device.
Since the processing is carried out by the IJ control section, the 80 command storage section does not become distorted, and after a certain period of time, the pointer comparator 9 detects a coincidence of pointers and returns to normal operation.

However, if a failure occurs again during the processing of the commands in the storage unit, in this embodiment, it is treated as a solid failure and a permanent stop is taken. Processing is restarted even when circle failures occur frequently,
Permanent suspension may be taken only after a certain number of times has been exceeded.

Although the present invention has been described above with reference to one embodiment, the present invention is not limited to this, and there are several alternatives.

For example, the 80 command storage unit includes as many entries as the number of Chibuteyan addresses, and O that associates the subchannel address with the address of the storage area.
Only the commands are stored, and instead of the 60 tatami entry pointer, the read pointer 7, and the pointer comparator 9, a scanner is provided to store the stored commands. The command may be processed.

Alternatively, selectors 3 and 4 may be eliminated by always storing 80 commands in the storage unit before processing even during normal operation.

Further, the number of commands to be accepted may be reduced by delaying the response of completion of command acceptance by the channel device by a time within a range that does not result in secondary # group.

Further, although the SVP has been described as a device independent of the processing unit, it may be provided within the processing unit.

According to this embodiment, even when processing is suspended, it is possible to respond to multiple commands issued by the channel device with command acceptance completion.
The occurrence of secondary failures can be reduced, and processing can be suspended until the collection of failure information is completed.
Sufficient failure information can be collected.

Furthermore, since the command storage part, command acceptance completion letter, and 9-word response part of the processing unit whose processing is suspended are still operating during the suspension of processing, it is possible that the collection of fault information from these parts will not be sufficient. , since the operating parts are limited and small, it is generally possible to eliminate faults within an acceptable range.
1, it does not become a major bottleneck in failure analysis. However, in a device where this deficiency cannot be ignored, the above processing σ]
It is also generally possible to eliminate the lack of fault IR information within the allowable range σ by losing the traces of these parts that are still operating during the interruption, generally using a conventional method.

〔Effect of the invention〕

According to the present invention, since the command acceptance completion is responded even while the fault information is being collected, the occurrence of secondary faults can be reduced and information can be collected for partial faults 1.

[Brief explanation of the drawing]

Figure 1 shows a dedicated S for processing unit and input/output control unit.
FIG. 2 is a configuration diagram showing a configuration example in which a processing device and an input/output control device share one SVP, and FIG. 6 is an input/output control device according to an embodiment of the present invention. FIG. 2 is a block diagram of a processing unit of the control device that is related to the present invention. 1...Address register 2...Command register 6.4...Selector 5...Processing control section 6...Write pointer 7...Read pointer 8...Command storage section 9... - Pointer comparator 10...Status word register 11...Selector 12...Command reception photon status word fixed storage section 13...Processing interruption latch 14...Failure detection gi 21.21'...Processing device 22, 22'...Channel device 23.23'...Communication control device 25, 25/...5VP 26...Disk control device 106...Collection completion signal Representative patent attorney Akio Takahashiノ I ear; [) 3rd close

Claims (1)

[Claims] 1. It is connected to the upper channel device, and after receiving a command from the channel device, it returns an acceptance completion response in response to the command, and when a fault occurs, the attached device collects the fault information. In the input/output control device that performs the processing, a storage means is provided for stacking the commands received from the previous TDY-Yanenoshi device when the processing is interrupted due to the occurrence of a failure, and the commands are stored in the storage unit during the processing interruption due to the collection of the failure information. An input/output control device characterized in that the input/output control device sequentially stores the commands in the means and returns the acceptance completion response to each of the commands.