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5.3.2 High Availability / Fault Tolerance
High Availability in computers generally
refers to another computer that is capable of continuing should one
fail. More modern fail over designs is capable of load sharing when
both systems are functioning normally and pick up the load on 'fail-over'.
If it is important…
Consider Fail over computer clusters
and computers designed for hot swapping components.
Fault Tolerance is the generally
accepted term for disk sub-systems. For example, RAID 1, also known
as disk mirroring because it has a complete byte-for-byte copy of the
other disk. Disk Duplexing adds to the idea of a second disk controller
preventing the violent failure of a single disk controller from trashing
both copies.
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