EMC CX500I Configuration Guide - Page 42

How a Hot Spare Works, no hot spare is available.

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0014 0013 0012 0011 0010 009 008 007 006 005 004 003 002 001 000 RAID Types and Trade-offs Hot Spare 1. RAID 5 Groups consist of disk modules 0-4 and 5-9; mirrored pairs are modules 10-11 and 12-13, disk module 14 is a hot spare. 2. Disk module 3 fails 3. RAID 5 Group becomes modules 0, 1, 2, 14, 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 the hot spare is 14. EMC2432 Figure 2-6 How a Hot Spare Works 2-12 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide

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2-12
EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide
RAID Types and Trade-offs
Figure 2-6
How a Hot Spare Works
EMC2432
0014
0013
0012
0011
0010
009
008
007
006
005
004
003
002
001
000
1.
RAID 5 Groups consist of disk modules 0-4 and 5-9;
mirrored pairs are modules 10-11 and 12-13, disk module
14 is a hot spare.
Disk module 3 fails
RAID 5 Group becomes modules 0, 1, 2, 14, and 4; now
no hot spare is available.
System operator replaces failed module 3 with a
functional module.
Once again, RAID 5 Group consists of modules 0-4 and
the hot spare is 14.
2.
3.
4.
5.
Hot
Spare