HP 3PAR InForm OS 3.1.1 CLI Administrator's Manual

NOTE: You must have an HP 3PAR Dynamic Optimization Software license to use the tunesys
command.
NOTE: Running the tunesys command does not eliminate the need to run the tunepd command.
The tunesys command performs space based balancing. The tunepd command performs service
time and I/O based balancing.
NOTE: The tunesys command verifies that logical disks associated with a CPG have the same
characteristics as the CPG. If the logical disk characteristics do not match the CPG, the logical disk
is modified to match the CPG characteristics.
Displaying Virtual Volume Space Distribution
The showvvcpg command displays how virtual volume space is distributed among CPGs.
• Display virtual volume space distribution by issuing the showvvcpg -domain
<domain_name|pattern> <vv_name|pattern|vv_set> command, where:
• -domain <domain_name|pattern> designates only virtual volumes that are in domains
with names matching one or more of the specified domain names or patterns is displayed.
Only virtual volumes within domains that the user is a member of can be listed. Multiple domain
names or patterns can be repeated using a comma-separated list.
• <vv_name|pattern|set:vv_set_name> indicates which virtual volumes, patterns, or
virtual volume sets are displayed. The virtual volume set specifier must start with set: and
followed by a virtual volume set name or pattern.
For more information about the showvvcpg command, see the HP 3PAR InForm OS Command
Line Interface Reference.
Tuning and Modifying Virtual Volumes
Use the tunevv command to improve the performance of a system by modifying the virtual volumes
to use all available hardware resources. You can also change the parameters, RAID levels, and
set sizes for virtual volumes. Modifying virtual volumes does not interrupt access to the virtual
volumes.
A good time to use the tunevv command is after changing the hardware configuration of your
system. When a system is upgraded by adding nodes, cages, or physical disks, the initial volume
and logical disk layouts may no longer be optimal for the new system configuration. Tuning your
system enables you to optimize the layout of volumes for the new system configuration.
You can schedule, monitor, and manage the tunevv command operations as a system task. For
information about system tasks, see “Managing Tasks” (page 123).
For more information about when to use the Dynamic Optimization feature and the tunevv
command, see the HP 3PAR InForm OS Concepts Guide.
NOTE: You must have an HP 3PAR Dynamic Optimization Software license to use the tunesys
command.
Changing Virtual Volume Layouts
Use the tunevv command to change the virtual volume’s parameters, RAID levels, and set sizes
by associating the virtual volume with a new CPG.
To change the layout of volumes following a hardware upgrade, perform the following:
1. Create a new CPG. See “Creating a Common Provisioning Group” (page 83) for instructions.
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