IBM Storwize V7000 Unified Problem Determination Manual page 459

1) In the Drive Class field, select the drive class of the candidate drive
(former spare) that is available based on the installed storage on the
system. Verify the correct number of disks is displayed.
2) In the Preset field, select the RAID configuration for the storage you are
configuring. If you are adding only one disk, the only RAID option is
RAID0 which does not provide any data protection.
3) Select Optimize for capacity to configure all available capacity.
4) Verify the configuration and click Next.
5) Click Expand an existing pool and select the storage pool that is used
for compression.
3. Check event logs to ensure all underlying volumes are back online. Before
bringing the file system back online ensure that all the errors for both the block
volumes and the file system have been resolved by completing these steps:
a. In the management GUI, select Monitoring > Events and select Block.
b. Run the fix procedures in the recommended order for all events that are
related to the block volume that is used by the file system.
c. Select File and fix all errors that are related to the offline file systems.
4. Bring file systems back online: After the capacity has been added to the
storage pool, bring the file system back online by completing these steps:
a. In the management GUI, select Files > File Systems.
b. Right-click the compressed file system that is offline and select Mount. If
the file system does not come back online you may need to restart all of the
disks that the file system uses Right-click the compressed file system that
went offline and select Start All Disks.
5. Prevent the file system from running out of capacity again:
First ensure that you have free capacity at least the size of the real capacity of
the temporary drive that you are adding.
To decrease the file system capacity, you can remove the disks (NSD) and the
corresponding mapping to block volumes to force migration of the data to
other NSDs, thus freeing up space on the file system. To remove an NSD,
contact IBM Remote Technical Support.
6. Return spare drives to the system: To ensure that drive redundancy is not
compromised, spare drives that were used to bring the offline file systems back
online need be replaced either by returning the original drive back to its spare
use or by adding a new drive to the system. Ensure that the file system
capacity has been decreased accordingly before returning the spare drives to
the systems. To return the drive back to its spare use, complete these steps:
a. In the management GUI, select Pools > Internal Storage.
b. From the list of drives that display, ensure that no MDisk are associated
with the drive. If the drive is associated with MDisk, select Pools > MDisks
by Pool. Right-click the MDisk and select Remove from Pool.
c. In the management GUI, select Pools > Internal Storage.
d. From the list of drives that display, right-click a drive you marked as a
candidate in Step 1 and select Mark as... > Spare .
e. Click OK.
To add additional drives to the system, complete these steps:
a. Acquire additional drives from IBM or vendor.
b. Install drives into available drive slots on the enclosure. See "Installing a
hot-swap hard disk drive" on page 149.
c. After the drives are available, select Pools > Internal Storage.
Chapter 8. Troubleshooting compressed file systems
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