MULTI-CPU FAILURE DETECTION/RECOVERY SYSTEM AND METHOD FOR THE SAME

• US 20090307526A1
• Filed: 08/20/2009
• Published: 12/10/2009
• Est. Priority Date: 03/12/2007
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Ohira, Yoshiyuki
• Granted Patent: US 8,074,123 B2
• Time in Patent Office: Days
• US Class Current: 714/10
• CPC Class Codes: G06F 11/0724 in a multiprocessor or a multi-core unit multiprocessors per se G06F15/80
• CPC Class Codes: G06F 11/0793 Remedial or corrective actions recovery from an exception in an instruction pipeline G06F9/3861; by retry G06F11/1402; for recovering from a failure of a protocol instance or entity H04L69/40

Abstract

A multi-CPU system including plural CPUs, comprising a failure state detection unit for detecting a failure in an operating program, and a recovery unit for determining, when the failure state detection unit has detected a failure, whether or not recovery of data involved in the failure is possible on the basis of content of the detected failure, and for recovering the data when recovery is determined to be possible.

Claims

1. A multi-CPU system including plural CPUs, comprising:

a failure state detection unit for detecting a failure in an operating program; and

a recovery unit for determining, when the failure state detection unit has detected a failure, whether or not recovery of data involved in the failure is possible on the basis of content of the detected failure, and for recovering the data when recovery is determined to be possible.

2. A method of detecting a failure and automatic recovery in a multi-CPU system including plural CPUs, comprising:

detecting a failure in an operating program;

determining, when the failure state detection step has detected a failure, whether or not recovery of data involved in the failure is possible on the basis of content of the detected failure, and for recovering the data when recovery is determined to be possible.

3. A computer-readable storage medium storing a program executed in a multi-CPU system including plural CPUs, causing the multi-CPU system to implement:

a function of detecting a failure in an operating program; and

a function of determining, when the failure state detection function has detected a failure, whether or not recovery of data involved in the failure is possible on the basis of content of the detected failure, and for recovering the data when recovery is determined to be possible.

4. The computer-readable storage medium according to claim 3, wherein:

a failure in obtainment of exclusive control is also detected as the detected failure, and when a time period that has elapsed since obtainment of exclusive control equals or exceeds a specified value, the operating program is determined to include a failure.

5. The computer-readable storage medium according to claim 4, comprising:

collecting data used for generating the specified value when obtaining and cancelling the exclusive control.

6. The computer-readable storage medium according to claims 3, wherein:

an interruption failure is also detected as the detected failure, and when a time period that has elapsed since interruption prohibition started equals or exceeds a specified value, the operating program is determined to involve a failure.

7. The computer-readable storage medium according to claims 3, comprising:

collecting data used for generating the specified value when setting and cancelling the interruption prohibition.

8. The computer-readable storage medium according to claims 3, wherein:

data used for recovering data is prepared in advance, and when recovery of the data is possible by using the data prepared in advance for recovery of the data, the data is recovered.

9. The computer-readable storage medium according to claims 3, wherein:

the recovery is performed by extracting, from the data, data that needs to be recovered, and by recovering the extracted data by using the data used for recovery.

10. The computer-readable storage medium according to claims 3, wherein:

when the failure is detected, the operating program requests a CPU other than an operating CPU to perform a recovery process.

11. The computer-readable storage medium according to claims 3, wherein:

a program used for recovering data is prepared in advance, and when recovery of the data is possible by using the program prepared in advance for recovery of the data, the data is recovered.

12. The computer-readable storage medium according to claim 11, wherein:

when there is a link between pieces of data to be recovered, the program used for recovering the data recovers the data by tracing the link.

13. The computer-readable storage medium according to claims 3, wherein:

when a result of the determination indicates that recovery is impossible, the system is shut down.