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

1. Create a new CPG with the parameters you wish to apply to the volume. See “Creating a
Common Provisioning Group” (page 80) 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 126).
CAUTION: Rollback and restart operations should not be performed on TPVVs.
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. For more information about tasks and viewing tasks, see “Managing
Tasks” (page 126)
2. Issue the tunevv rollback <VV_name> command.
Restarting a Volume Modification Task
Restarting a tunevv task restarts a task that was previously interrupted. You may choose to restart
a tunevv task if the operation was interrupted because of:
• User-initiated cancellation of a task.
• Component failure.
To restart a tunevv task, issue the tunevv restart <VV_name> command.
Tuning Physical Disks
HP 3PAR System Tuner Software is an optional feature that improves performance by identifying
over-used physical disks, and performing load balancing on those disks without interrupting access.
Use the tunepd command to perform tuning tasks on physical disks. You must purchase the HP
3PAR System Tuner Software license to use the tunepd command.
Troubleshooting Modifying Virtual Volumes 177