IBM Advanced SerialRAID Adapters SA33-3285-02 User Manual page 70

Figure 20 shows an alternative method of protecting RAID-5 arrays against the
complete failure of an SSA Enclosure. This method uses a different hot spare disk drive
to protect each member of the array.
Enclosure-1
Enclosure-2
Enclosure-3
Figure 20. Pools along, and Hdisks across, Enclosures
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User's Guide and Maintenance Information
Pool A1
hdisk
pdisk
Pool A2
pdisk
Pool A3
pdisk
hdisk
pdisk
pdisk
pdisk
Spare
Spare
Spare