I/O control apparatus having check recovery function

Details I/O control apparatus having check recovery function I/O control apparatus having check recovery function

1997-01-13

1999-08-03

Beausoliel, Jr., Robert W.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

G06F 1100

Patent

active

059319542

ABSTRACT:
In a computer system, when a CPU performs a state setting operation, such as setting an appropriate operation mode for I/O devices, the log data of the state setting operation is stored in a log storage area. Upon occurrence of a fault in the computer system, the I/O devices are cleared, and the state setting operation of the I/O devices is performed on the basis of the log data of the prior state setting operation stored in the log storage area. Therefore, the states of the I/O devices can be recovered to a state at a checkpoint when the process is restarted.

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C. Kubiak et al., "Penelope: A Recovery Mechanism For Transient Hardware Failures and Software Errors," FTCS 12th Annual International Symposium: Fault Tolerant Computing, Jun. 22-24, 1982, pp. 127-133.
J.G. Earle et al., "Multiprocessing Checkpoint Retry," IBM Technical Disclosure Bulletin, vol. 14, No. 2, Jul. 1971, pp. 358-361.

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