HP 3PAR OS 3.1.3 Command Line Interface Reference

tunesys
DESCRIPTION
The tunesys command is used to analyze and detect poor layout and disk utilization across an
entire across an entire storage system. The command runs a series of low level operations to
re-balance resources on the system.
SYNTAX
tunesys [options]
AUTHORITY
• Super, Edit
• Any role granted the sys_tune right
OPTIONS
-chunkpct <percentage>
Controls the detection of any imbalance in PD chunklet allocation between PDs owned by individual
nodes. If a PD has utilization of <percentage> less than the average for that device type, then
that disk can potentially be tuned. Used in conjunction with the diskpct option. <percentage>
must be between 1 and 100. The default value is 5. This option cannot be used with the -cpg
option.
-cpg <CPG name or patterns>
Limits the scope of a tunesys operation to the named CPG(s). The specified CPGs must all be in
the same domain as the user. The -diskpct and -chunkpct options cannot be used with this
option.
-diskpct <percentage>
Specifies the percentage of disks identified by the -chunkpct option over which PD chunklet level
tuning will be started. <percentage> must be between 1 and 100. The default value is 10. This
option cannot be used with the -cpg option.
-dr
Specifies that the command is a dry run and that the system will not be tuned. The result of the
analysis will be displayed.
-f
Do not ask for confirmation.
-maxchunk <number>
Specifies the maximum number of chunklets which can be moved from any PD in a single operation.
<number> must be between 1 and 8. The default value is 2.
-maxtasks <number>
Specifies the maximum number of inter-node tune tasks which the tunesys command can run
simultaneously. <number> must be between 1 and 8. The default value is 2.
-nodepct <percentage>
Control the detection of any imbalance between LD capacity allocation between nodes. If any LD
in a group is <percentage> greater than the average of the group, then the VVs associated with
that LD will be tuned. The <percentage> parameter must be between 1 and 100. The default
value is 3.
-tunenodech
Specifies that only intra-node chunklet level rebalancing only should be performed.
tunesys 653