Adaptec 2169400-R User Guide - Page 163
RAID 5EE Logical Drives
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Appendix C: Selecting the Best RAID Level ● 163 RAID 5EE Logical Drives A RAID 5EE logical drive-also referred to as a hot space-is similar to a RAID 5 logical drive except that it includes a distributed spare drive and must be built from a minimum of four disk drives. Unlike a hot spare (see page 81), a distributed spare is striped evenly across the disk drives with the stored data and parity data, and can't be shared with other logical disk drives. A distributed spare improves the speed at which the logical drive is rebuilt following a disk drive failure. A RAID 5EE logical drive protects your data and increases read and write speeds. However, capacity is reduced by two disk drives' worth of space, which is for parity data and spare data. In this example, S represents the distributed spare, P represents the distributed parity data. Disk Drive 1 250 GB Drive Segment Size (Smallest Disk Drive) Disk Drive 2 250 GB Disk Drive 3 400 GB Disk Drive 4 400 GB Disk Drives in Logical Drive Disk Drive 1 1 S ... P Disk Drive 2 2 P ... 449 Disk Drive 3 S 3 ... S Disk Drive 4 P 4 ... 500 Unused Space = 150 GB Unused Space = 150 GB RAID 5EE = 500 GB plus Parity and Spare Logical Drive
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