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- Created 2012-03-19
is switching to a
, hardware component or
upon the failure or
of the previously active
, server, system, hardware component, or network. Failover and
are essentially the same operation, except that failover is automatic and usually operates without warning, while switchover requires human intervention.
ers usually provide failover capability in servers, systems or networks requiring continuous availability -the used term is
- and a high degree of
At server level, failover automation usually uses a "
" cable that connects two servers. As long as a regular "pulse" or "heartbeat" continues between the main server and the second server, the second server will not initiate its systems. There may also be a third "spare parts" server that has running spare components for "hot" switching to prevent downtime. The second server takes over the work of the first as soon as it detects an alteration in the "heartbeat" of the first machine. Some systems have the ability to send a notification of failover.
In 1992 in coordination with Distributed Processing Technology and Black Box Cables; Darryl Brown developed a Failover PC Server configuration that allowed for the failover of mirrored or RAID 1 drive sub systems actively connected to two servers. The configuration allowed a production server to failover within minutes of a server hardware failure by manually switching to the spare server with a flip of a switch.
Some systems, intentionally, do not failover entirely automatically, but require human intervention. This "automated with manual approval" configuration runs automatically once a human has approved the failover.
is the process of restoring a system, component, or service in a state of failover back to its original state (before failure).
The use of
software has allowed failover practices to become less reliant on physical hardware; see also teleportation (virtualization)
from Wikipedia (last updated: 05 December), licensed under
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