Recovery Scenario: File System Offline - IBM Storwize V7000 Unified Problem Determination Manual

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.

Recovery scenario: File system offline

In this situation, the storage pool has run out of capacity. As a result, the file
system is unmounted and has gone offline, which makes all I/O to the file system
fail.
To recover from this situation, you can either add available MDisks to the pool, or
if free MDisks are not available, you can make spare drives available to build a
new array (MDisk) to add to the pool. However, because spare drives are
automatically used as backup drives when other drives fail on the system, using a
spare drive to recover an offline file system can prevent an automated recovery if
another drive fails on the system. After the file system is brought back online and
capacity deficiencies have been addressed, return the drive to use as a spare or add
another drive to replace it as a spare. If you add a new drive, new drives must be
added to the system.
Adding capacity to the storage pool
If MDisks are available to provide extra capacity to the storage pool that the
compressed file system uses, you can add MDisks to the pool or create more
MDisk (arrays).
Add any available MDisks: If an MDisk has already been created but not assigned
to a pool, complete these steps:
1. In the management GUI, select Pools > MDisk by Pools.
2. Select Not in pool to display all the available MDisks that are not currently
3. Right-click the MDisks that you want to add to the storage pool and select Add
4. On the Add to Pool dialog, select the pool and click Add to Pool.
5. Verify that the MDisk was added to the selected pool by expanding the pool
Add any available drives: If MDisks have not been configured from available
internal drives, you can provision the available drives into existing storage pools
by completing these steps:
1. In the management GUI, select Pools > Internal Storage.
2. Select Configure Storage.
3. On the Configure Internal Storage dialog, select Select a different
allocated to a storage pool.
to Pool.
and ensuring that the added MDisk is displayed.
configuration and complete the following steps:
a. In the Drive Class field, select the drive class that is available based on the
installed storage on the system.
b. In the Preset field, select the RAID configuration for the storage you are
configuring.
c. Select Optimize for capacity to configure all available capacity.
d. Verify the configuration and click Next.
e. Click Expand an existing pool and select the storage pool that is used for
compression.
Chapter 8. Troubleshooting compressed file systems
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