JPH0242519A - Automatic restoring method for computer - Google Patents

Abstract

PURPOSE:To automatically restore a computer to the state set before occurrence of the abnormality like a service interruption at release of this service interruption by referring to the memory data for the IPL program processing and recognizing the process state of the computer at occurrence of the abnormality to perform the due processing. CONSTITUTION:When the supply of the prescribed voltage is started to a CPU 1, a power-on IPL function works and an IPL program is loaded to a memory 2 from a disk device 4. Then the IPL program is executed by the CPU 1. The IPL program loads the basic part of an operating system into the memory 2 and actuates the operating system. Then the IPL program reads the data showing the computer application processing state stored in the device 4 out of a file 5 and restarts automatically the due processing as long as the contents of data show an application processing state. While the IPL end state is held in case the contents of data show a non-application processing state.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to computer systems that stop due to power outages, etc.
The present invention relates to an automatic computer recovery method when power supply is resumed after that.

[Conventional technology]

FIG. 13 is a configuration diagram of a computer applied to the conventional computer automatic recovery method. 3 is a memory backup battery for retaining the contents of memory 2 in the event of a power outage; 4 is a memory for recording program contents loaded onto memory 2 and normal processing results as files. The operation of this disk device will be explained next. When a power outage is detected by the CPUI, the CPU records in the memory 2 data indicating which command of the program being executed should be executed next and data indicating that a power outage has occurred, and stops processing.

The contents recorded in the memory 2 are retained even during a power outage by supplying voltage sufficient to retain the memory contents from the battery backup battery 3 to the memory 2.

When the power outage is restored and the power supply voltage value supplied to the CPUI reaches a predetermined level, the CPUI automatically restores the computer in memory. IPL (initial program load day and program program program that was in the middle of execution at the time of the power outage) refers to data indicating whether the calculation instruction before the error occurred should be executed next during program processing. While the machine is processing an application, the non-application starts processing from the command indicated by the above data, and the processing state of other applications is restored to the processing state before the power outage. Is it possible to receive messages from other computers? [Problem to be solved by the invention]
Or refer to the contents of the file that records this processing status.The conventional automatic recovery method for computers is structured as described above.
Since the contents of memory 2 are stored in non-volatile storage means such as 1), it is necessary to maintain the contents of memory 2 even during a power outage by referring to the data indicating the completion status of the processing. Memory buffer □Automatically restores the computer processing state to the state before the error occurred
It is necessary to add □, and it has been made obsolete.

In addition, power outages may become longer and the battery capacity may be exceeded.
[Operation] The automatic computer recovery method according to the present invention has had its drawbacks, such as when the contents of the memory 2 are not retained and automatic computer recovery is no longer possible.
Calculator application? In order to solve the above-mentioned problems, this invention uses data that indicates batch processing for memory backup, which is done in the application at the start of application processing. An automatic recovery method for a computer that automatically restores non-application processing to the normal state at the end of shutdown processing when an abnormality such as a power outage is removed without an application. The purpose is to obtain.

[Means to solve the problem]

The data stored in this non-volatile storage means can be transferred to the computer's IP address.
It is referenced in the L program processing, and based on this data, the processing state of the computer at the time of the abnormality is recognized.In other words, if the data content indicates that the application is being processed, the IPL is executed.
After completion, application processing is started, and if non-application processing is in progress, the state is restored to the IPL processing completed state.

【Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a CPU that executes a program, 2 is a memory that temporarily saves the program and data indicating the execution state of the program, and 4 is a file that records the program contents and processing results loaded onto the memory 2. A disk device 5 is a file (non-volatile storage means) that records data indicating the application processing status of the computer (application processing in progress, non-application processing in progress).

Next, the operation will be explained. In Figure 1, when the power outage is restored and a predetermined voltage begins to be supplied to the CPUI, the CPU
The power-on IPL function of the UI operates, and the engineering PL program shown in the flowchart of FIG.
The IPL program is loaded into the memory 2, and the loaded IPL program is executed by the CPU 1. 5 As shown in FIG. 2, the IPL program stores the basic parts of the operating system in the memory 2 in step ST1.
After the operating system is in a state where the operating system is running, in step ST2, data indicating the application processing status of the computer in the disk device 4 is read from the file 5, and in step ST3, the data content indicates that the application is being processed. If so, step ST4
It is determined that a power outage has occurred during application processing, and the application processing is automatically restarted.

In addition, if the data content indicates that non-application processing is in progress in step ST3, it is assumed that a power outage has not occurred during processing, and the state (IPL, completion state) before application processing is maintained and the recovery process is performed. end.

FIG. 3 shows a flowchart of a data setting program for file 5 at the start of application cage processing.
In FIG. 3, when application processing is started, the CPU updates the contents of file 5 to data indicating that the application is being processed in step ST5, starts the application program in step ST6, and ends this data update process. do.

FIG. 4 is a flowchart of the data setting program for file 5 when application processing is stopped, and when application processing is finished, step S
At T7, the contents of the file 5 are updated to data indicating that non-application processing is in progress, and at step ST8, the application program is stopped.

In addition, in the above embodiment, a case was shown in which data indicating the application processing status of the computer is recorded in the file 5 of the disk device 4, but the above data is recorded in an auxiliary storage device other than the disk device 4 as shown in FIG. (Nonvolatile storage means) 6 (Magnetic tape, floppy disk, etc.) may be provided as a file.

Furthermore, as shown in FIG. 6, the above data may be realized by a hardware state holding circuit (non-volatile storage means) 8 such as a latching relay via a data input interface 7 and a signal line 9 for data setting. The status output held in this eight-domain storage circuit 8 is transmitted to the CPU 1 via the status output signal line 10 and the data input/output interface 7.

Further, in the embodiment shown in FIG. 1 above, automatic recovery of two types of states, ie, during application processing and during non-abbreviation processing, was explained, but the present invention can be applied even when there are three or more processing states. The same effects as in the above embodiment are achieved.

FIG. 7 is a block diagram of a fourth embodiment of the invention,
In this FIG. 7, 11 is a CPU that executes application processing, 12 is an application processing and O8
(Operating system) A memory for recording software programs during execution; 14 a disk device for recording programs loaded onto the memory 12 and processing results by application programs as files; 15 a communication unit for exchanging data; The other computer (non-volatile storage means) 16 is data stored in the other computer 15 that indicates the application processing state of the computer (application processing, non-application processing).

Next, the operation will be explained. In FIG.

When the power outage is restored and the specified voltage begins to be supplied to CPU II, the power-on IPL function of CPU 1 will operate.
The engineering PL program shown in the flowchart of FIG. 8 is loaded from the disk device 14 into the memory 12, and the loaded IPL program is executed by the CPU II.

As shown in FIG.
T11 stores the basic parts of the operating system in memory 1.
After loading on computer 2 and making the operating system operational, in step 5T12, load the operating system on computer 1.
5, the CPU 11 adjusts the contents of data 16 indicating the application processing status of the computer (application processing, non-application processing) and outputs a message.

Thereafter, in step 5T13, the CPU II receives a response message to this message from the other computer 15,
From the contents, the contents of the data 16 indicating the application processing state of the computer are recognized.

If the content of this data 16 indicates that the application is being processed in step 5T14, it is determined that a power outage has occurred while the application is being processed, and step 5T15
will automatically restart the applica- tion shimin process.

Further, in step 5T14, if it is determined that the content of the data 16 indicates that non-application processing is in progress,
Assuming that no power outage has occurred during the processing, the recovery processing is ended while maintaining the state before starting the application processing (IPL completion state).

FIG. 9 is an execution flowchart of a message sending program to other computers 15 at the start of application processing.
At T16, a message indicating that the application is being processed is sent to the other computer 15, and at step 5T17, the application program is started.

Furthermore, FIG. 10 shows a flowchart of a message sending program to other computers 15 when application processing is stopped. When application processing is completed, a message indicating that non-application processing is in progress is sent to other computers 15 in step 5T18. , step 5T19
Stop the application program.

FIG. 11 shows a timing chart showing changes in the state of the computer, message exchange timing, and changes in the contents of the data 16 indicating the application processing state in the fake computer 15.

In this FIG. 11, since the data 16 indicating the application processing state in the fake computer 15 is in non-application processing at first, after the computer loads the engineering PL program into the memory 12, the engineering PL program sends a makeshift message to another. When the message is sent to the computer 15, a response message (a message being processed by a non-application) is received from the other computer 15. Therefore, the computer starts a new application process and sends a message to the other computers 15 to update the application process.

Therefore, the other computer 15 updates the application processing state while the application is being processed.

During this application processing, a power outage occurs, and when the power is restored, the computer loads the IPL program into memory at power-on, and sends an interim message to other computers 15 to inquire about the application processing status. Since a response message (application processing in progress) is sent to the computer from the other computer 15, the computer performs application processing recovery.

When the recovery process is finished and the application process is completed, the computer stops the application process and
A message to update the application processing status (non-application processing in progress) is sent to other computers 15, and data 1 indicating the application processing status in the other computers is sent.
6 is a non-application case and is being processed.

In the embodiment shown in FIG. 7, messages are exchanged when application processing starts and stops, and the fake computer 1
5, the data 16 indicating the application processing status can be updated in the case of a computer that regularly exchanges messages at regular intervals. Information indicating the application processing status may be included in a part of the exchanged message, and the data 16 indicating the processing status may be updated at each reception timing according to the content.

In this case, by simply adding data indicating the application processing status to the regular message exchange data, the same effect as the above embodiment can be achieved without adding any special protocol.

FIG. 12 shows a timing chart showing changes in the state of the computer, message exchange timing, and changes in the contents of the data 16 indicating the application processing state in the fake computer 15 in the case of the above modification.

In this FIG. 12, since the application processing state in the fake computer 15 is initially in non-application processing, the other computer 15 sends a regular message (non-application processing response) to the computer, and the computer stores the IPL program in the memory. and sends a regular message (non-application processing notification) to the other computer 15.

When the other computer 15 receives this message, it sends a regular message (non-application processing response) to the computer, and the computer sends a regular message (non-application processing notification) to the other computer 15.

Next, a regular message (non-application processing response) is sent from the other computer 15 to the computer.

When application processing is started, a regular message (application processing notification) is sent to the other computer 15, and the other computer 15 sends a regular message (application processing response) to the computer.

When a power outage occurs and the power is restored, other computers 15
Since a regular message (response during application processing) is sent to the computer from medium response) is sent to the computer.

Next, when the application processing is stopped, the computer sends a regular message (non-application processing notification) to the other computer 15. The application processing state in the other computer 15 becomes non-application processing, and the other computer 15 sends a regular message (non-application processing response) to the computer.

〔Effect of the invention〕

As described above, according to the present invention, a message indicating the application processing state of a computer before an abnormality such as a power outage occurs during processing of an IPL program is received from another computer with which messages are exchanged, and the contents are referenced. Alternatively, the computer can be automatically restored to the state before an abnormality such as a power outage occurred by referring to data indicating the application processing state stored in a nonvolatile storage means, such as by referring to the contents of a file that records the application processing state. With this configuration, the apparatus can be made inexpensive, and no matter how long an abnormal state such as a power outage lasts, it is possible to automatically restore the processing state to the state before the abnormality such as a power outage.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a computer applied to an automatic computer recovery method according to an embodiment of the present invention, FIG. 2 is an execution flowchart of an IPL program according to the above embodiment, and FIG. 3 is a start of application processing according to the above embodiment. FIG. 4 is an execution flowchart of the data setting program when application processing is stopped according to the same embodiment, and FIGS. 5 to 7 are according to the second to fourth embodiments of the present invention, respectively. A configuration diagram of a computer applied to the automatic computer recovery method, FIG. 8 is an execution flowchart of the IPL program of the embodiment of FIG. 7, and FIG. 9 is a message sending program at the start of application processing of the embodiment of FIG. 7. FIG. 10 is a flowchart of the message sending program when application processing is stopped in the embodiment of FIG. 7, FIG. 11 is a message exchange timing chart of the embodiment of FIG. Timing chart of an embodiment in which data indicating application processing status is added to regular messages of computers exchanging messages, 1st
FIG. 3 is a configuration diagram of a computer applied to the conventional automatic computer recovery method. 1 and 11 are CPUs, 2 and 12 are memories, 4 and 14 are disk devices, 5 is a file (non-volatile storage means), and 6 is an auxiliary storage bag W (non-volatile storage means). 8 is a hardware state holding circuit (non-volatile storage means);
15 is another computer (non-volatile storage means). In addition, in the figures, the same reference numerals indicate the same or equivalent parts. (Non-volatile 19th demon child stage) Diagram diagram (Non-volatile pillar caretaker role) 3rd r! lJ Figure Figure

Claims (1)

[Claims] In a computer that has an initial program loading program at power-on, data indicating other application processing states during application processing or non-application processing of the computer before an abnormality such as a power outage occurs during the processing of the initial program loading program. An automatic recovery method for a computer, characterized in that the application processing state of the computer is automatically restored to the state before the abnormality occurred by referring to the above from a non-volatile storage means.