HP 3PAR InForm OS 3.1.1 CLI Administrator's Manual

2. Change the layout of the volume by issuing the tunevv usr_cpg <CPG_name> <VV_name>
command, where:
• usr_cpg <CPG_name> is the name of the CPG created previously in Step 1, indicating
the user space of the new CPG will be used.
• <VV_name> is the volume you are modifying.
• <VV_name> is the volume you are modifying.
Thinly-Provisioned Virtual Volumes
By default, Thinly-Provisioned Virtual Volumes (TPVVs) and their underlying Common Provisioning
Groups (CPGs) dedicate space from all available resources as they grow, both from preexisting
and new drive capacity resources. This natural expansion capability of TPVVs reduces the need
for changing the layout of TPVVs after adding disks.
To change the layout of TPVVs following a hardware upgrade, perform the following:
1. Create a new CPG. See “Creating a Common Provisioning Group” (page 83) for instructions.
2. Tune the user space of the volume by issuing the tunevv usr_cpg <CPG_name>
<volume_name> command, where:
• usr_cpg <CPG_name> is the name of the CPG created in Step 1, indicating the user
space of the new CPG will be used.
• <volume_name> is the TPVV you are modifying.
3. Tune the snapshot space of the volume by issuing the tunevv snp_cpg <CPG_name>
<volume_name> command, where:
• snp_cpg <CPG_name> indicates the CPG to where the snapshot space is moved.
• <volume_name> is the TPVV you are modifying.
Fully-Provisioned Virtual Volumes
To change the layout of fully-provisioned virtual volumes following a hardware upgrade, perform
the following:
1. Create a new CPG. See “Creating a Common Provisioning Group” (page 83) for instructions.
2. Tune the user space of the volume by issuing the tunevv usr_cpg <CPG_name>
<volume_name> command, where:
• usr_cpg <CPG_name> is the name of the CPG created previously in Step 1, indicating
the user space of the new CPG will be used.
• <volume_name> is the fully-provisioned virtual volume you are modifying.
3. Tune the snapshot space of the volume by issuing the tunevv snp_cpg <CPG_name>
<volume_name> command.
• snp_cpg <CPG_name> indicates the CPG to where the snapshot space is moved.
• <volume_name> is the fully-provisioned virtual volume you are modifying.
Changing Virtual Volume RAID Levels
Thinly-Provisioned Virtual Volumes
To change the RAID type of a TPVV, perform the following:
1. Create a new CPG with the RAID type to which you wish to change the volume. See “Creating
a Common Provisioning Group” (page 83) for instructions.
146 Performance Tuning