v Any volume that tries to expand (such as new data being written to a
compressed volume) is taken offline.
v Taking a file volume offline takes the Network Shared Disk (NSD) offline
because each NSD is made from one file volume.
v Taking meta data (NSD) offline takes the whole file system offline (but putting
meta data in a compressed volume is not allowed).
v The file system is unmounted if it is offline for more than 30 seconds.
v This is different from the file system filling up, which causes the file system to
enter read only mode.
There are two options to recover from this:
v Increase the storage pool capacity.
v Free the unusable blocks in the compressed volumes.
Table 118. Recovering from offline compressed volumes.
Scenario Recovery Procedure Who does it?
Storage pool warning (80%
full)
Provision more storage to
pool
You
You (Storwize V7000 fix
procedure)
Compression ratio wrong
(file system still online)
Increase the storage to pool
size
Or
Free the unusable blocks in
the compressed volumes.
You (with help from this
page)
You (with help from IBM
Remote Technical support)
Storage pool full (file
system offline)
Provision more storage to
pool
You (Storwize V7000 fix
procedure)
Storage pool full (file
system offline) No
available storage
Borrow hot spare disks,
bring file system online, free
up space, shrink filesystem,
return hot spare disks
You (with help fro IBM
Remote Technical Support)
Increasing the Storage pool capacity
To increase storage pool capacity, add more RAID arrays to the storage pool using
the management GUI.
Storage can be taken or borrowed from the block allocation to resolve out of space
conditions in the file allocation. Point in time block copies are a good candidate for
deletion.
Storwize V7000 Unified can virtualize external block storage controllers. If spare
capacity is available on other block storage controllers then you can virtualize
those and add the mdisks to the volume storage pool.
Free the unusable blocks in the compressed volumes
If you cannot increase the storage pool capacity then contact IBM Remote Technical
Support to help you.
Recovering from a 1001 error code
A 1001 error code indicates that the Storwize V7000 control enclosure has
automatically performed a recovery. The control enclosure CLI is now restricted to
make sure that there are no more block storage configuration changes until IBM
Remote Technical Support has checked that it is safe for block storage
configuration changes to be allowed again.
Chapter 7. Recovery procedures 411
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