From the Enhanced Storage tool within the Solaris Management Console, open the Hot Spare Pools node and select a hot spare pool. Choose Action->Properties to get detailed status information. For more information, see the online help.
Run the following form of the metastat command:
Here is sample output from the metastat command on a hot spare pool.
# metastat hsp001 hsp001: 1 hot spare c1t3d0s2 Available 16800 blocks
The metahs command can also be used to check the status of hot spare pool.