Installation guide

Glossary
Manual No. 771961 G-13
Target ID
A target ID is the ID of a device attached to a controller.
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 drive will receive the
data at a more appropriate time, in order to increase controller performance.
An optional cache battery backup or an Uninterruptable Power Supply
(UPS) can be used to protect against data loss as a result of a power failure or
system crash during the time the data is only in the cache.
Write Through Cache
Refers to a caching strategy whereby data is written to the drive before
completion status is returned to the host OS. This caching strategy is
considered more secure, since a power failure is less likely to cause loss of
data. However, a write through cache results in a slightly lower performance.