3PAR InForm® OS 2.3.1 CLI Administrator's Manual (320-200180 Rev B, February 2010)

16.4
Changing Virtual Volume Layouts
3PAR InForm CLI Administrator’s Manual InForm OS Version 2.3.1
16.3 Changing Virtual Volume Layouts
With the tunevv command you can change the virtual volume’s parameters, RAID levels, set
sizes, and disk filters by associating the virtual volume with a new CPG. You must purchase a
3PAR Dynamic Optimization license to use this command.
To change the layout of volumes following a hardware upgrade, perform the following:
1 Create a new CPG. See 7.4 Creating a Common Provisioning Group on page 7.6 for
instructions.
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.
16.3.1 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
pre-existing 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 7.4 Creating a Common Provisioning Group on page 7.6 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 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.