HP Surestore Disk Array 12h - And FC60 Service Manual page 401

and parity to implement data redundancy. The RAID levels supported by the disk array
include RAID 1, RAID 3, and RAID 5.
RAID 1
A RAID level in which the LUN uses a single mirrored pair of disks. One disk serves as
the data disk, and the other serves as the mirror disk.
RAID 0/1
A RAID configuration in which the LUN uses both mirroring for redundancy, and disk
striping for performance. Half the disks serve as the data disks, and half serve as the
mirror disks. Up to 30 disks can be included in a RAID 0/1 LUN.
RAID 5
A RAID configuration in which the LUN uses data parity to for redundancy, and disk
striping for performance. RAID 5 is efficient in its use of disk space, but suffers a
performance penalty when performing write I/Os. Up to six disks (one per enclosure)
can be used in a RAID 5 LUN.
rebuild
The process of reconstructing the data that was on a failed disk onto another disk,
typically a global hot spare. The disk array reconstructs the data using mirrored data or
parity information, depending on the RAID level of the LUN. Until a rebuild is complete,
the disk array is operating in degraded mode and is vulnerable to a second disk failure.
reconstruction
See rebuild.
resident controller
The last controller to complete the Start-Of-Day process in a given slot. At the
completion of the SOD process, the identification of the controller is stored. This
controller remains the resident controller until another controller completes the SOD
process in the same slot. See foreign controller.
SAM (System Administration Manager)
A host-based system configuration and management utility.
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