HP 3PAR InForm OS 3.1.1 CLI Administrator's Manual

Changing Virtual Volume Parameters
Thinly-Provisioned Virtual Volumes
To change the parameters of a TPVV, perform the following:
1. Create a new CPG with the parameters you wish to apply to the volume. See “Creating a
Common Provisioning Group” (page 83) for instructions.
2. Issue the tunevv usr_cpg <CPG_name> <TPVV_name> command, where:
• usr_cpg <CPG_name> is the name of the CPG created previously in Step 1.
• <TPVV_name> is the TPVV you are modifying.
Fully-Provisioned Virtual Volumes
To change the parameters of a fully-provisioned virtual volume, perform the following:
1. Create a new CPG with the parameters you wish to apply to the volume. See “Creating a
Common Provisioning Group” (page 83) for instructions.
2. Issue 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.
• <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.
Troubleshooting Modifying Virtual Volumes
When performing a tunevv task, errors can occur that can interrupt the task. Depending on the
cause of interruption, you can either rollback or restart a tunevv task.
You can schedule, monitor, and manage the tunevv command operations as a system task. For
information about system tasks, see “Managing Tasks” (page 123).
CAUTION: Rollback and restart operations should not be performed on Thinly-Provisioned Virtual
Volumes.
Rolling Back a Volume Modification Task
Rolling back a tunevv task restores a volume to its state prior to the initiation of the task. Essentially,
issuing a rollback command performs an undo of the operation. You may choose to roll back a
tunevv task if the operation was interrupted because of:
• Lack of space.
• User-initiated cancellation of a task.
To perform a rollback operation, perform the following:
1. Issue the canceltask <task_ID> command, where <task_ID> is the ID of the tunevv
task you wish to cancel. Refer to “Managing Tasks” (page 123), for information about tasks
and viewing tasks.
2. Issue the tunevv rollback <VV_name> command.
148 Performance Tuning