JP3185446B2 - Computer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer system, and more particularly to a computer system having an uninterruptible power supply.

[0002]

2. Description of the Related Art In recent years, with the spread of online transaction processing in computer systems, there has been an increasing demand for continuing processing without stopping the system.
The same applies to a power failure, and even when a power failure occurs, it is required to continue processing without stopping the system.

Conventionally, in a computer system equipped with an uninterruptible power supply as a measure against a power failure, when a power failure occurs, the computer is switched to the uninterruptible power supply and the OS
Executes shutdown processing so that it can be restarted, and then stops the system. Such a power supply backup method is described in, for example, Toshiba Review (1992 Vo
l. 47 No. 11 p. 883-p. 886) Or, alternatively, it is disclosed in JP-A-3-288220.

[0004]

In the above conventional method, when a power failure occurs and the shutdown process is executed,
Even after recovery from a power failure, there is a problem that the shutdown process is continued and the system is stopped unconditionally.

Accordingly, an object of the present invention is to solve such a technical problem in the related art, and to terminate the shutdown processing when the power supply failure is recovered during the shutdown processing of the OS and to start the shutdown processing due to the power failure. A power supply backup device and a power supply backup method capable of continuing the above processing.

[0006]

In order to achieve the above object, a power supply backup device of the present invention is provided with an uninterruptible power supply, and executes a shutdown process for stopping a system when a power failure occurs. In the computer system, a means for detecting recovery from a power failure in the uninterruptible power supply, and means for notifying the processing apparatus of recovery from a power failure detected by the detection means,
The processing device, when receiving the notification of recovery from the power failure during the execution of the shutdown process, suspends the shutdown process that is being performed, and restarts the process that was being performed before the power failure occurred I have.

[0007]

According to the present invention, a computer system is equipped with an uninterruptible power supply. When a power failure occurs, the computer system switches to the uninterruptible power supply, and the OS executes a shutdown process. When recovering from the power failure during the shutdown process, the uninterruptible power supply detects that the power failure has been recovered, and notifies the processing device of the recovery. Upon receiving the power restoration interrupt, the processing device ends the shutdown process, refers to the contents of the memory, issues a restart instruction, and restarts the process that was being executed before the occurrence of the power failure.

[0008] Thus, when the power supply recovers from the power failure during the shutdown processing, the system can be stopped without stopping.
Processing immediately before the occurrence of a power failure can be continued.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of a computer system to which the present invention is applied.

In FIG. 1, reference numeral 1 denotes a commercial power supply, 2 denotes an uninterruptible power supply, and 3 denotes a computer system to which power is supplied from the power supply 2. The uninterruptible power supply 2 is a charging device 2-
1. Power failure / recovery detection circuit 2-2 and switch 2-
3

Normally, the computer system 3 is supplied with power from the commercial power supply 1 via the power line 6 via the uninterruptible power supply 2. When a failure occurs in the commercial power supply 1, the uninterruptible power supply 2 detects that the power failure has occurred by the power failure / recovery detection circuit 2-2, and detects the occurrence of the power failure via the power failure signal line 4. Notify the computer system 3.
At the same time, the switch 2-3 is controlled to start supplying power from the charging device 2-1. Similarly, when the power is restored after the occurrence of the power failure, the computer system 3 is notified via the power restoration signal line 5 that the computer system 3 has recovered from the power failure.

FIG. 2 is a configuration diagram showing an example of the computer system 3. The computer system 3 includes a processor 10, an OS 20 running on the processor 10, a memory 11 for holding an application program (AP) executed by the OS 20, a system monitoring device 12, a power control device 13,
It includes an IOP 14 for controlling I / O, and a disk device 15 connected to the IOP 14. FIG.
The power failure signal line 4 and the restoration signal line 5 shown in FIG.

When the system monitoring device 12 receives a notification of the occurrence of a power failure from the uninterruptible power supply 2 via the power failure signal line 4, the system monitoring device 12 generates a power failure interrupt 30 and
0 is notified of the occurrence of a power failure. Further, upon receiving the notification of the recovery from the power failure via the power recovery signal line 5, the system monitoring device 12 generates a power recovery interrupt 31 and notifies the processor 10 of it.

The processing procedure from the occurrence of a power failure to its recovery will be described below.

FIG. 3 is a schematic diagram showing the operation from the occurrence of a power failure until recovery.

First, a failure occurs in the commercial power supply 1 (process 100). The power failure / restoration detection circuit of the uninterruptible power supply 2 detects the power failure and switches the power supply to the computer system 3 from the commercial power supply to the uninterruptible power supply 2 (process 101). The operation of the computer system 3 is guaranteed by the power supply from the uninterruptible power supply 2 (process 102).

The system monitor 12 receives a power failure from the uninterruptible power supply 2 via the power failure signal line 4 (process 103), generates a power failure interrupt 30, and causes the processor 10 to execute the power failure. The OS 20 is notified (step 104).

At this time, the software is executing the AP (business program) 21 (process 105). Upon receiving the power failure interrupt 30, the OS 20 running on the processor 10 suspends the processing of the AP 21 (processing 106) and continues the shutdown processing for saving the contents of the memory 11 to the disk device 15 (processing 107).

While the OS 20 is executing the shutdown process, the commercial power supply 1 recovers from the failure (process 110). The power failure / recovery detection circuit 2-2 of the uninterruptible power supply 2 detects that the commercial power supply 1 has recovered from the failure, and switches the power supply source to the computer system 3 to the commercial power supply 1 (Process 1).
11).

The system monitoring device 12 receives from the uninterruptible power supply 2 via the restoration signal line 5 that the power supply has recovered from the power failure (process 112). Further, the system monitoring device 12 generates a power restoration interrupt 31 and notifies the OS 20 that is executing shutdown processing on the processor that the power supply has been recovered from the power failure (process 113).

When the OS 20 receives the power restoration interrupt 31,
After terminating the shutdown process, the process refers to the contents of the memory 11 and issues a process restart instruction to the AP 21. Thereby, the AP 21 resumes the process interrupted by the power failure interrupt 30 (process 114).

Hereinafter, a processing procedure when the commercial power supply 1 recovers from the failure while the OS 20 is executing the shutdown processing will be described in more detail with reference to FIGS.

First, two methods will be described as examples of the shutdown processing of the OS 20 assumed here.

(1) Method 1 When the OS 20 receives the power failure interrupt 30, the OS 20 requests all the APs 21 that are being executed to perform termination processing. AP
21 executes end processing in response thereto, and upon completion thereof, returns a completion notification to the OS 20. And OS20 is A
Upon receiving the completion notification from P21, the contents of the memory 11 are stored in the disk device 15, and the system is stopped.

To start up the system again, O
S20 is started from the disk device 15.

(2) Method 2 In this method, the OS 20 does not issue an end request to the AP 21. Upon receiving the power failure interrupt 30, the OS 20 saves the contents of the memory 11 as a memory image to the disk device 15 and stops the system.
As a result, the status information of the AP 21 being executed before the start of the shutdown process is stored in the disk device 15 as it is. When starting up the system, the disk device 1
By transferring the information saved in 5 to the memory 11,
It is possible to start up the system by reproducing the system state immediately before the start of the shutdown processing.

Hereinafter, the OS 20
A procedure for recovering from a power failure during the shutdown process of FIG.

First, a case where the shutdown processing of the method 1 is applied will be described.

FIG. 4 is a diagram showing a processing procedure when the shutdown processing of the method 1 is applied.

When the OS 20 receives the power failure interrupt 30 from the system monitoring device 12, the OS 20 starts a shutdown process.

The OS 20 first requests the currently executing AP 21 to perform an end process (process 150). The AP 21 executes end processing in response to this (step 151), and notifies the OS 20 when the end processing ends (step 152). Next, the OS 20 determines whether or not the power restoration interrupt 31 indicating that the power has recovered from the power failure has occurred (Step 153). If the power restoration interrupt 31 has occurred, the terminated AP 21 is activated (process 154), and after the activation is completed, the contents of the memory are referred to and the next to the instruction executed immediately before the power failure interruption 30 occurs. The process is restarted from the instruction (process 155).

If the power restoration interrupt 31 has not occurred at this time, the area of the memory 11 is divided (step 156).
The contents of the memory 11 are transferred to the disk device 15 for each area (process 157). And during the transfer of memory contents,
It is determined whether or not the power restoration interrupt 31 has occurred (step 15
8) If the power restoration interrupt 31 has occurred, the contents written to the disk device 15 are invalidated. (Process 15
9). Thereafter, the terminated AP 21 is activated (Process 1).
54) After the startup, referring to the contents of the memory 11, the processing is restarted from the instruction following the instruction executed immediately before the occurrence of the power failure interrupt 30 (process 155).

If the power restoration interrupt 31 has not occurred in the process 158, it is determined whether or not all the contents of the memory 11 have been stored in the disk device 15 (process 160).
If all the contents in the memory 11 are not stored in the disk device 15, the processing of the processing 157 to the processing 160 is repeatedly executed.

All contents of the memory 11 are stored in the disk device 1
After that, it is further determined whether or not the power restoration interrupt 31 has occurred (step 162).
If 1) has occurred, the process proceeds to step 159, in which the contents written to the disk device 15 are invalidated, the processes 157 and 158 are executed, the AP 21 is started, and the process is restarted. At this time, the system may be started from the disk device 15 without continuously starting the AP 21 (process 163).

If there is no power restoration interrupt 31 in step 162, the power failure still continues, so the computer system 3 is stopped and the processing is terminated (step 16).
4).

Next, a case where the shutdown processing of the method 2 is applied will be described with reference to FIGS.

First, the embodiment of FIG. 5 will be described.

When the OS 20 receives the power failure interrupt 30 from the system monitoring device 12 and starts the shutdown processing, it first divides the area of the memory 11 (processing 20
0). The contents of the memory 11 are transferred to the disk device 15 for one area as a memory image (process 201). Then, it is determined whether or not the power restoration interrupt 31 has occurred (processing 2
02), if the power restoration interrupt 31 has occurred, invalidate the content written in the disk device 15 (process 203).
With reference to the contents of the memory 11, the processing is restarted from the instruction following the instruction executed immediately before the occurrence of the power failure interrupt 30 (process 204). If the power restoration interrupt 31 has not occurred, subsequently, it is determined whether or not all the contents of the memory 11 have been transferred to the disk device 15 (process 205).

All contents of the memory 11 are stored in the disk device 1
If not, the process returns to the process 201 to repeatedly execute the transfer of the contents of the memory 11 and the determination of the occurrence of the power restoration interrupt 31.

Processing 20 without receiving power restoration interrupt 31
If it is determined in step 5 that the transfer of all the memory contents has been completed, the computer system 3 is stopped and the processing is terminated (processing 207).

In the embodiment shown in FIG. 5, every time the contents of the memory 11 are stored in the disk device 15 for one area, it is checked whether or not the power restoration interrupt 31 has occurred. After transferring to the disk device 15,
A check for the power restoration interrupt 31 may be performed. The state of the process in this case will be described with reference to FIG.

When the OS 20 receives the power failure interrupt 30 from the system monitoring device 12, the OS 20 starts a shutdown process. The OS 20 first transfers the contents of the memory 11 to the disk device 15 as a memory image (Process 23).
0). Then, the entire contents of the memory 11 are stored in the disk device 1.
Upon completion of the transfer to S.5, it is determined whether or not the power restoration interrupt 31 has occurred (process 231). In the process 231, if the power recovery interrupt 31 is received, the OS 20 invalidates the content written in the disk device 15 (process 232), and refers to the content of the memory 11 and immediately before the power failure interrupt 30 occurs. Then, the processing is restarted from the instruction following the instruction executed (step 233).

The OS 20 stores the disk contents 1 of the memory contents.
If the power recovery interrupt 31 is not received after the transfer to
The computer system 3 is stopped (process 234), and the process ends.

[0045]

According to the present invention, after a power failure occurs, when the power supply recovers from the power failure while the shutdown processing is being executed, the shutdown processing is terminated without stopping the system. There is an effect that the business program can be continued.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the computer system of FIG. 1;

FIG. 3 is a schematic diagram of a processing procedure.

FIG. 4 is a diagram illustrating a processing procedure when the first shutdown processing is applied.

FIG. 5 is a diagram illustrating a first processing procedure when a second shutdown processing is applied;

FIG. 6 is a diagram illustrating a second processing procedure when the second shutdown processing is applied.

[Explanation of symbols]

1 ... commercial power supply, 2 ... uninterruptible power supply, 3 ... computer system.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiminori Yamada 5030 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within Hitachi, Ltd.Software Development Division (72) Inventor Toshiyuki Kinoshita 1099 Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Prefecture Hitachi, Ltd., System Development Laboratory (56) References JP-A-3-29015 (JP, A) JP-A-1-103129 (JP, A) JP-A-3-50615 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) G06F 1/30 G06F 1/26

Claims (3)

(57) [Claims] 1. A computer system equipped with an uninterruptible power supply, wherein a processing unit executes a shutdown process for stopping a system when a power failure occurs, a means for detecting recovery from the power failure in the uninterruptible power supply. And means for notifying the processing device of the recovery from the power failure detected by the detection means, wherein the processing device notifies the recovery from the power failure during the execution of the shutdown processing.
Check the presence or absence, if the notification of recovery from the power failure is received, stop the shutdown process that is being performed,
A computer system characterized by restarting processing that was being performed before a power failure occurred. 2. The power supply system according to claim 2, wherein
2. The computer system according to claim 1, further comprising a process of transferring information in a main memory included in the processing device to an external storage device connected to the processing device while checking a notification of recovery from the processing device. 3. The computer system according to claim 2, wherein said shutdown processing performs an end processing of a running business program prior to said transfer processing.