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RAID Types
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RAID Types and Tradeoffs
Figure 2-6 How a Hot Spare Works
EMC1819
0 1 2 3 4 5 6 7 8
9
Hot
spare
1. RAID 5 Group consists of disk modules 0-4; RAID 1
mirrored pair is modules 5 and 6; hot spare is module 9.
2. Disk module 3 fails.
3. RAID 5 Group becomes modules 0, 1, 2, 9, and 4; now
no hot spare is available.
4. System operator replaces failed module 3 with a
functional module.
5. Once again, RAID 5 Group consists of modules 0-4 and
hot spare is 9.