HP LH3000r HP NetServer FCArray Assistant - Installation and User Guide - Page 155
Dual-Active Duplex Mode, Duplex Mode, Error Table, Hot Replacement of Disks Hot Swap, Intelligent
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Appendix B Glossary Dual-Active (Duplex) Mode This is a method of interconnecting multiple RAID controllers that share a common set of drives. In addition to increasing overall performance, this method allows a surviving controller to take over resources of a failed controller. This "failover" process is transparent to the host. Duplex Mode See "Dual-Active (Duplex) Mode." Error Table See "Bad Block Table (or Bad Data Table)." Hot Replacement of Disks ("Hot Swap") The design of RAID controllers allows for the replacement of failed hard disk drives without interruption of system service. In the event of a drive failure on a properly configured system (where the data redundancy features of the controller are used), system service continues without interruption. A message is generated by the system to alert the system operator. When a replacement drive becomes available, the system operator can remove the failed disk drive, install a new disk drive, and instruct the controller to "rebuild" the data on the new drive, all without interrupting system operations. Once the rebuild is complete, the controller will be brought back into a fault tolerant state. IBBU See "Intelligent Battery Backup Unit." Intelligent Battery Backup Unit The Intelligent Battery Backup Unit (IBBU) is an add-on module that provides power to a compatible RAID Controller cache memory in the event of a power failure. The battery backup module monitors the write back cache on the controller, and provides power to the cache if it contains data not yet written to the drives when power is lost. LUN See "Logical Unit Number (LUN)." LUN Mapping RAID Controller LUN Mapping allows logical drives (or system drives) to be made available or unavailable on one or more host ports. The mapping is performed by assigning Logical Unit Numbers (LUNs) to logical drives. The LUN 149