IBM System Storage DS3000, Programming Manual

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Maximum capacity allowed: 1,862.645 GB
Current capacity: 557.792 GB
Additional capacity allowed 1,304.852 GB
Drive capacities: All 278.896 GB
Quality of Service (QoS) Attributes
Security capable: No
Secure: No
T10PI capable: No
Associated drives:
Enclosure Slot
0 4
0 11
Volumes using Performance Read Cache: volume_test
By reviewing this information, you can make sure that your Performance Read Cache is running as you
want it to run. For example, if the current capacity is close to the maximum capacity, you might want to
add another drive to your Performance Read Cache.
Adding drives to and removing drives from the Performance Read Cache
After you have created your Performance Read Cache, you might decide that you do not have enough
capacity and want to add a drive. Conversely, you might decide that you have too much capacity and
that you want to remove a drive to make the drive available for a Array or disk pool.
You can increase the capacity of an existing Performance Read Cache by using this command to add solid
SSDs:
set performanceReadCache [performanceReadCacheName]
addDrives=(enclosureID1,drawerID1,slotID1 ...
enclosureIDn,drawerIDn,slotIDn)
You can add one or more SSDs by specifying the location of the drives that you want to add. For
high-capacity drive enclosures, specify the enclosure ID value, the drawer ID value, and the slot ID value
for each SSD that you want to add. For low-capacity drive enclosures, specify the enclosure ID value and
the slot ID value for each SSD that you want to add. Enclosure ID values are 0 to 99. Drawer ID values
are 1 to 5. Slot ID values are 1 to 32. Enclose the enclosure ID values, the drawer ID values, and the slot
ID values in parentheses.
If you want to remove drives, you can use this command:
set performanceReadCache [performanceReadCacheName]
removeDrives=(enclosureID1,drawerID1,slotID1 ...
enclosureIDn,drawerIDn,slotIDn)
You cannot remove all of the SSDs from the Performance Read Cache using this command; at least one
SSD must remain in the Performance Read Cache. If you want to completely remove the Performance
Read Cache, use this command:
delete performanceReadCache [performanceReadCacheName]
When you run this command, all data in the Performance Read Cache is purged.
Locating drives in the Performance Read Cache
The drives that comprise the Performance Read Cache might be dispersed throughout the storage
subsystem. For maintenance or other reasons, you might be required to find the drives in the
Performance Read Cache. You can locate the drives in the Performance Read Cache using this command:
start performanceReadCache [performanceReadCacheName] locate
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IBM System Storage DS3000, DS4000, and DS5000: Command Line Interface and Script Commands Programming Guide