HP Surestore Disk Array 12h - And FC60, Advanced User'S Manual, Page: 444 / 466

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disk array controller
A printed-circuit board with memory modules that manages the overall operation of the
disk array. The disk array controllers manage all aspects of disk array operation,
including I/O transfers, data recovery in the event of a failure, and management of disk
array capacity. There are two controllers (A and B) in the disk array enclosure. Both
controllers are active, each assuming ownership of LUNs within the disk array.
disk group
A collection of individual disks that share a common role in disk array operation. All
disks on the disk array will be a member of one of the following disk groups: a LUN, hot
spare, or unassigned.
disk module
The individual disk drive assemblies used in the disk array. Each module houses a
single disk. Up to ten disk modules can be installed in each disk system.
disk striping
A performance-enhancing technique in which data is distributed in uniformly sized
segments across all the disks in a LUN. Striping allows multiple sets of read/write heads
to simultaneously execute an I/O, resulting in improved performance. RAID 5 LUNs use
disk striping.
disk stripe size
In a LUN using disk striping, the stripe size is calculated by multiplying the stripe
segment size times the number of disks in the LUN.
disk system
The enclosure that contains the disk modules used by the disk array. Each disk system
includes its own BCC controllers, power supplies, and cooling fans. Up to six disk
systems can be connected to the disk array.
Fibre Host ID
Numbers that identify each controller to the host or other devices on the Fibre Channel
network.