Hardware manual

Group Administration Advanced volume operations
10–17
To unbind a volume from a member, use the following CLI command format:
volume select volume_name unbind
See the PS Series CLI Reference manual for more information about using CLI commands.
Managing a volume or snapshot with lost blocks
In rare circumstances, a volume (or snapshot) might lose blocks. For example, this can occur if there is a power
failure and then a control module cache battery fails. (If the control module cache battery is the only power source
for a control module for more than 72 hours after a power failure occurs, the battery can fail.)
If a volume (or snapshot) loses blocks, the current status of the volume (or snapshot) is
offline-lost-cached-
blocks
. In addition, the group generates an event message.
1. Click
Volumes, then expand Volumes, then select the volume name, and then click the status tab.
2. Click
offline-lost-cached-blocks.
3. In the dialog box that appears, do one of the following:
• Click
Set the volume online but retain the lost blocks to set the volume or snapshot
online but keep the lost blocks.
The volume (or snapshot) status changes to
online-lost-blocks.
If an application tries to read a lost block, an error occurs. If an initiator writes new data to a lost
block
before it is read, the block is no longer lost. The members containing lost blocks have a status of
RAID
lost blocks
until initiators write to all the lost blocks.
• Click
Mark the lost blocks valid and set the volume online to set the lost block status to
valid.
The volume (or snapshot) status changes to
online. The status of the members containing volume data
changes to
online.
4. Click
OK.
Note: Setting a volume with lost blocks online is a data integrity risk. The blocks might contain old or
invalid data.