Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 43
Hot Spares, Table 2.2, Spanning for RAID 10, RAID 50, and RAID 60
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Table 2.2 Spanning for RAID 10, RAID 50, and RAID 60 Level 00 10 50 60 Description Configure RAID 00 by spanning two contiguous RAID 0 virtual drives, up to the maximum number of supported devices for the controller. Configure RAID 10 by spanning two contiguous RAID 1 virtual drives, up to the maximum number of supported devices for the controller. RAID 10 supports a maximum of eight spans. You must use an even number of drives in each RAID virtual drive in the span. The RAID 1 virtual drives must have the same stripe size. Configure RAID 50 by spanning two contiguous RAID 5 virtual drives. The RAID 5 virtual drives must have the same stripe size. Configure RAID 60 by spanning two contiguous RAID 6 virtual drives. The RAID 6 virtual drives must have the same stripe size. 2.4.13 Hot Spares A hot spare is an extra, unused drive that is part of the disk subsystem. It is usually in standby mode, ready for service if a drive fails. Hot spares permit you to replace failed drives without system shutdown or user intervention. MegaRAID SAS RAID controllers can implement automatic and transparent rebuilds of failed drives using hot spare drives, providing a high degree of fault tolerance and zero downtime. Note: When running RAID 0 and RAID 5 virtual drives on the same set of drives (a sliced configuration), a rebuild to a hot spare will not occur after a drive failure until the RAID 0 virtual drive is deleted. The RAID management software allows you to specify drives as hot spares. When a hot spare is needed, the RAID controller assigns the hot spare that has a capacity closest to and at least as great as that of the failed drive to take the place of the failed drive. The failed drive is removed from the virtual drive and marked ready awaiting removal once the rebuild to a hot spare begins. You can make hot spares of the drives that are not in a RAID virtual drive. You can use the RAID management software to designate the hot spare to have enclosure affinity, meaning that if there are drive failures present on a split backplane configuration, the hot spare will be used first on the backplane side that it resides in. Components and Features 2-11
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