HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 394
disk array controller, disk group, disk module, disk striping, disk stripe size, disk system
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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. 394