HP 5300 - Manual (Page 149)

Glossary
Glossary-2 HP Smart Array 5300 Controller User Guide
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Writer: Jennifer Hayward File Name: w-glossary
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Automatic Data Recovery
Also known as rebuild. A process that automatically reconstructs data from a failed drive and
writes it onto a replacement drive. Rebuild time depends on several factors, but at least 15
minutes should be allowed per gigabyte.
cache
A high-speed memory component, used to store data temporarily for rapid access.
capacity expansion
Abbreviation for array capacity expansion. The addition of physical drives to a pre-existing
drive array, and redistribution of existing logical drives and data over the enlarged array. The
size of the logical drives does not change. This feature is available only with HP or Compaq-
branded array controllers that have a battery-backed array accelerator installed.
capacity extension
Abbreviation for logical drive capacity extension. The enlargement of a logical drive without
disruption of data. There must be free space on the array before extension can occur. If
necessary, create free space by deleting a logical drive or by carrying out a capacity
expansion. Capacity extension can be carried out online with some operating systems.
controller duplexing
A type of fault tolerance that requires two Smart Array controllers. Each controller has its
own set of drives, and the drive sets have identical data. When one controller fails, the other
automatically takes over the servicing of requests. Controller duplexing is available only for
some operating systems.
CPQONLIN
An array configuration utility for NetWare that can be used while the server is online.
data guarding
See RAID.
data striping
Writing data to logical drives in interleaved chunks (by byte or by sector). This technique
improves system performance.
drive mirroring
See RAID.