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Mylex DAC960PG Guide d'installation Page 101

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Glossary
Manual No. 771971 Glossary-11
Write Back Cache
Refers to a caching strategy whereby write operations result in a completion
signal being sent to the host operating system as soon as the cache (not the
disk drive) receives the data to be written. The target SCSI drive will receive
the data at a more appropriate time, in order to increase controller
performance. An optional cache battery backup can be used to protect
against data loss as a result of a power failure or system crash.
Write Through Cache
Refers to a caching strategy whereby data is written to the SCSI drive before
a completion status is returned to the host operating system. This caching
strategy is considered more secure, since a power failure will be less likely to
cause loss of data. However, a write through cache results in a slightly lower
performance.
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