9.5.01 HP P4000 SAN Solution User Guide (AX696-96168, February 2012)

Table 44 Requirements for changing volume characteristics
Requirements for ChangingItem
Must be from 1 to 127 characters.Description
Server must have already been created in the management
group.
Server
Migrating a volume to a different cluster requires the target
cluster to:
Cluster
• Reside in the same management group
• Have sufficient storage systems and unallocated space
for the size and data protection level of the volume
being moved
The volume resides on both clusters until all of the data is
moved to the new cluster. This causes a restripe of the data
on both clusters. For example, you create a new cluster in
the management group to expand the storage capacity in
the management group. You want to migrate an existing
volume to the new cluster as part of the capacity
management.
NOTE: The volume remains fault-tolerant while being
moved.
The rate of the data migration and the resulting impact on
performance can be controlled by the Local Bandwidth
Priority setting for the management group. See “Editing a
management group” (page 116) for information about local
bandwidth priority settings.
The cluster must have sufficient storage systems and
unallocated space to support the new data protection level.
Data protection level
For example, you just added more storage to a cluster and
have more capacity. You decide to change the data
protection level for a volume from Network RAID-0 to
Network RAID-10 to ensure you have redundancy for your
data.
Before changing the size of a volume, refer to “Changing
the volume size on the server” (page 153)
To increase the size of the volume:
Size
• If you have enough free space in the cluster, simply
enter the new size
• If you do not have enough free space in the cluster,
delete volumes and/or snapshots, or add a storage
system to the cluster
To decrease the size of the volume (not recommended)
• If the volume has been or is mounted by any operating
system, you must shrink the file system on the volume
before shrinking the volume in the CMC.
• You also should not decrease the size of the volume
below the size needed for data currently stored on the
volume.
CAUTION: HP recommends that you do not decrease the volume size. If you shrink the volume
in the CMC before shrinking it from the server file system, your data will be corrupted or lost.
To edit a volume
1. In the navigation window, select the volume you want to edit.
2. Click Volume Tasks and select Edit Volume.
Editing a volume 159