SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

Considerations for Removing a Disk From a Storage Pool
When you remove a disk from a storage pool:
• The POOL name is removed from the disk label if the pool process for the disk is not defined
in the system.
• SCF asks you to confirm the command in these cases:
The POOL process for the disk is not in the STARTED state.◦
◦ Virtual disks associated with the pool are not in the STARTED state.
◦ The physical volume has storage-managed files on it.
◦ Avoid overriding any safety checks whenever possible. Excluding a disk from a storage
pool even though a discrepancy exists could have severe consequences. For example,
storage-managed files on a physical volume are still accessible after the physical volume
has been excluded from a storage pool, but the catalog for the storage pool is no longer
in a consistent state.
• You might be able to correct discrepancies created by safety overrides by using the SMFIXUP
utility. (See the Storage Management Foundation User’s Guide.)
Example
To remove a disk from a storage pool:
-> ALTER $DATA, POOL EXCLUDE
Altering Storage Pool Attribute Values
Use the “ALTER POOL Command” (page 233) to change the attributes of a storage pool.
Considerations for ALTER POOL
• TMF must be running on the system when you alter a storage pool.
• The SMF Master Process ($ZSMS) must be in the STARTED state.
• These attributes require that the storage pool process be in the STOPPED state or not running:
STARTSTATEPRIMARYCPUBACKUPCPU
PROGRAMHIGHPIN
Changes take effect when you restart the process.
All other storage pool process attributes can be altered regardless of whether the storage pool
process is running and regardless of its state.
Example
1. If necessary, stop the storage pool:
-> STOP $POOL00
2. Change one or more “ALTER POOL Attributes” (page 234). For example, to change how often
$POOL00 collects information about physical volumes in the pool:
-> ALTER $POOL00, UPDATESTATS 3
3. Verify the configuration change:
-> INFO $POOL00, DETAIL
4. Restart the storage pool:
-> START $POOL00
Configuring a Storage Pool for Disk Drives 139