HP SureStore E Disk Array 12H User's and Service Manual (C5445-90901, September 1999)

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Glossary
Glossary
Active Hot Spare An Active Hot Spare is a portion of the disk array capacity reserved to
perform a rebuild. An Active Hot Spare ensures that the disk array can
maintain Data Redundancy if a disk fails. Until it is needed, the disk
array uses the Active Hot Spare space as RAID 0/1 capacity, which
improves array performance. An Active Hot Spare does not sit idle; it is
used to increase the disk array performance until it is needed.
Adapter A printed circuit assembly that translates data between the host
processor’s internal bus and a different bus, such as SCSI.
Arbitrated Loop See Fibre Channel–Arbitrated Loop.
Auto Configuration Most disk arrays require disk drives to be of matched capacities,
performance, and often, manufacturers. A disk array is not restricted to
use disks of the same capacity or even performance to function in the
array. A process of Auto Configuration permits the Disk Array
Controller to recognize and include disks of varying capacity and
performance. This means that future disk drives of higher capacity and
better performance may be supported for use in the disk array.
Auto Failover When two controllers are present, one serves as the Primary Array
Controller, and the other becomes the Secondary Array Controller: If
either controller fails, the other controller has the ability to assume the
role of Primary Array Controller, thus allowing uninterrupted access to
all user data with no downtime. Meanwhile, the failed controller can be
removed, then replaced by a new array controller, without any
downtime, loss of data, or interruption to the host computer system.
AutoRAID
™
Array Technology AutoRAID
™
is a trademark of Hewlett-Packard Company for the disk
array product. HP AutoRAID
™
implements RAID technology
automatically, without requiring you to know all the complexities of
determining and setting up different RAID modes.