Compex Systems Advanced SerialRAID Adapters SA33-3285-02 - Manual (Page 69)

Figure 19 shows how RAID-5 arrays can be protected against the complete failure of an
SSA enclosure. Each pdisk of each array (hdisk) is in a different SSA enclosure. The
hot spare disk drives are also in a different enclosure. Pools A1 and A2 each contain an
hdisk and a hot spare disk drive. The pools ensure that, if any one SSA enclosure fails
completely, three disk drives are always available for each hdisk.
Pool A2
hdisk hdisk
Pool A1
Enclosure-1
Enclosure-2
Enclosure-3
Enclosure-4
pdisk
pdisk
pdisk
Spare Spare
pdisk
pdisk
pdisk
Figure 19. Pools and Hdisks across Enclosures
Chapter 5. Hot Spare Management 49