HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 401
RAID 1, rebuild, reconstruction, resident controller, SAM System Administration Manager
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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. 401 Glossary