Dual XPCS for disaster recovery in multi-host computer complexes

Details Dual XPCS for disaster recovery in multi-host computer complexes Dual XPCS for disaster recovery in multi-host computer complexes

1997-01-07

1999-08-17

Kulik, Paul V.

Data processing: database and file management or data structures

Database design

Data structure types

39518213, 711164, G06F 1730

Patent

active

059408260

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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