that is needed to protect the array in the selected pool. No error log entry is made until
the number of hot spare disk drives that remains in the pool is less than the Hot Spare
Minimum parameter.
Rules for Hot Spare Disk Drive Pools
vBy default, all hot spare disk drives are in pool zero.
vPool zero is calledA0 for hot spare disk drives that are on SSA loop A, and B0 for
hot spare disk drives that are on SSAloop B.
vHot spare pool numbers are in the rangeA0 through A31 and B0 through B31. The
pool number is automatically assigned when a hot spare pool is created.
vArrays in pool zero can never use hot spare disk drives that are assigned to other
hot spare pools.
vEach pdisk can be assigned to a hot spare pool.
vEach member disk drive of a RAID array can be assigned to a different hot spare
pool.
vDisk drives can be added to a new pool only if they are in pool zero.
vIf a disk drive is removed from a hot spare pool, that disk drive moves to pool zero.
vAhot spare pool can exist only on an SSA loop. For example, hot spare pool B1 on
adapter ssa0 has no physical or logical connection to hot spare pool B1 on adapter
ssa1.
vAhot spare pool can contain any number of hot spare disk drives. For instructions on
how to configure hot spare pools, see Chapter6, “Using the RAID Array
Configurator”on page 57.
vIf the Choose Hot Spare Only from Preferred Pool option is set to yes, hot spare
disk drives are selected only from the hot spare pool that contains the failing member
disk drive.
vIf the Choose Hot Spare Only from Preferred Pool option is set to no, the selected
hot spare disk drive can be:
–Ahot spare disk drive that is in the hot spare pool that contains the failing
member disk drive
–Ahot spare disk drive that is in hot spare pool zero
–Ahot spare disk drive that is in any other hot spare pool
vIf more that one hot spare disk drive is available in a pool, and the hot spare disk
drives are of different sizes, the smallest appropriate disk drive is selected.
52 User’s Guide and Maintenance Information