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Chapter 5. Hot Spare Management
With all levels of adapter code, disk drives can be configured to be hot spare disk
drives. These hot spare disk drives can be used in any array that is on the same SSA
loop. If the adapter microcode level is at, or higher than, level 50, each hot spare disk
drive can be configured to a particular hot spare pool. The pdisks of arrays can also be
configured to hot spare pools. You can, therefore, control which hot spare disk drive is
to replace a particular failed member of an array. This chapter describes the ways in
which you can use hot spare pools.
Deciding how to Configure Hot Spare Disk Drive Pools
RAID-1 and RAID-10 arrays provide data protection by writing the same data to two
disk drives at the same time. You can provide more data protection if you put the two
disk drives into separate physical domains. These physical domains can be separate
SSA disk enclosures, separate power sources, or separate rooms or buildings. When
you use separate physical domains, you provide some capability to recover from an
unrecoverable loss of power.
For a RAID-1 or RAID-10 array to be able to recover after the failure of a physical
domain, at least one copy of the data must remain available. It is important, therefore,
that the action of replacing a failing disk drive with a hot spare disk drive does not
cause an array member to move to another physical domain.
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