Dual XPCS for disaster recovery in multi-host computer complexes
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Jan 7, 1997
filing date -
Jan 7, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A computer system having dual outboard devices for generating audit trail sequence numbers and performing file locking. One embodiment includes a master and a slave outboard device, where lock request handling includes a lock request first sent to the master, lock grant awaited, followed by a request sent to the slave. Unlock request handling includes sending an unlock request to slave first, followed by sending an unlock request to the master. Obtaining a system sequence number includes always reading the slave outboard device, then reading the master outboard device. The computer system includes a method for switching host processors from a single outboard device mode to a dual outboard device mode and back again in the event of failure of one of the outboard devices.
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