must be of the same as the disk drives that they are protecting. For example, if you have a expansion drawer and a expansion drawer in the same , you must select hot spares to protect both types of disk drives. If you pick only Fibre Channel disk drives to use as hot
spares, none of the SATA disk drives will be protected.
Note:
If hot spares are not available that have the same physical capacity, a disk drive with lower capacity may be used as a hot
spare if the “used capacity” of the used disk drive is the same as or smaller than the lower capacity hot spare.
Hot spares must have capacities equal to or larger than the disk drives that they are protecting. For example, if you have
an 18-GB disk drive with a configured capacity of 8 GB, you could use a 9-GB or larger disk drive as a hot spare. However,
if the configured capacity on the disk drive climbs to 12 GB, a 9-GB hot spare would not be big enough if a disk drive failure
were to occur. In this case, it would be ideal to have an 18-GB hot spare disk drive. Generally, you should not assign a disk
drive as a hot spare unless its capacity is equal to or greater than the capacity of the largest disk drive on the storage
subsystem.