A backup operation that automatically switches to a standby database, server or network if the primary system fails or is temporarily shut down for servicing. Failover is an important fault tolerance function of mission-critical systems that rely on constant accessibility. Failover automatically and transparently to the user redirects requests from the failed or down system to the backup system that mimics the operations of the primary system.
Getting Failover Right It's not easy, but with a little planning and testing, host bus adapter and
RAID failover can be done without hurting performance.
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