HP 3PAR Command Line Interface Administrator's Manual: HP 3PAR OS 3.1.2 (QR482-96525, September 2013)

• -usr_aw <percent> is the allocation warning alert limit for the user space specified as a
percentage. This generates an alert when the user space of the volume exceeds a specified
percentage of the volume’s size.
• -usr_al <percent> is the allocation limit of the user space specified as a percentage.
This prevents the user space from exceeding a specified percentage of the volume’s size.
• <user_CPG> is the name of the CPG from which the created virtual volume will draw its user
space.
• <VV_name> is the name of the volume being created. The name can be up to 31 characters.
• <VV_size g|G|t|T> is the size of the volume in MB, GB, or TB. If g|G|t|T is not specified,
VV_size is the number of MBs. For example, 50g specifies 50 GBs.
For a complete list of options available for the createvv command, see the HP 3PAR Command
Line Interface Reference and the HP 3PAR CLI Help.
Modifying Virtual Volumes
Existing virtual volumes can be modified to use a new name, draw space from a different CPG,
set allocation warnings, or to use new policies.
To modify a volume to draw its snapshot space and administration space from a different CPG,
issue the setvv -snp_cpg <CPG_name> -usr_cpg <user_cpg> <VV_name> command,
where:
• <CPG_name> is the name of the CPG from which the modified volume will draw its snapshot
space and administration space.
• <user_CPG> is the name of the CPG from which the modified virtual volume will draw its
user space.
• <VV_name> is the name of the virtual volume being modified.
For a complete list of options available for the setvv command, see the HP 3PAR Command Line
Interface Reference and the HP 3PAR CLI Help.
Growing Virtual Volumes
You can increase the size of, or grow, an existing virtual volume’s user space automatically when
the volume reaches capacity.
To automatically increase the user space available to a virtual volume when the volume reaches
capacity, issue the growvv <VV_name> <size g|G|t|T> command, where:
• <VV_name> is the name of the virtual volume you are growing.
• <size g|G|t|T> is the amount of space automatically added to the user space in MB, GB,
or TB. If g|G|t|T is not specified, VV_size is the number of MBs.
For a complete list of options available for the growvv command, see the HP 3PAR Command
Line Interface Reference and the HP 3PAR CLI Help.
Converting Virtual Volumes Online
You can convert existing fully-provisioned virtual volumes to TPPVs, and you can convert TPVVs to
fully-provisioned virtual volumes on the array, without disrupting normal storage system operations
and without requiring changes to any host applications that access the virtual volumes. If a TPVV
is using most of its allocated storage capacity, you can convert the volume to a fully-provisioned
virtual volumes in order to increase its storage capacity and allow for continued growth of the
volume. When a TPVV reaches approximately 80% of capacity, the incremental benefit of capacity
savings versus accelerating performance is weighted towards performance. In addition, converting
TPVVs to fully-provisioned virtual volumes can free up thinly-provisioned capacity for other TPVVs.
84 Managing CPGs and Virtual Volumes