System_Task; Tune_Vv; Tune_Vv_Restart - HP 3PAR StoreServ 7200 2-node Administrator's Manual

system_task

The system_task task type tracks the housekeeping tasks periodically run by the system. You
can display any active housekeeping tasks with the showtask-all command. Only the 3parsvc
user can run, change, or remove these tasks.
CLI housekeeping tasks and commands:
The move_back_chunklet runs the moverelocpd command.
The remove_expired_vvs runs the removevv command.
The system_task task type has only one phase and one step.

tune_vv

The tune_vv task type is used to track tunevv operations performed with the System Tuner
tunevv command. Dynamic Optimization is an optional HP 3PAR OS feature that allows you to
identify over-used physical disks and perform load balancing on them. The tunevv command
enables you to perform load balancing and to dynamically change volume parameters.
You can suspend an active tune_vv task using the canceltask command and the task ID as
follows:
cli# canceltask <task_ID>
select q=quit y=yes n=no: y
After cancelling the task, you can perform one of two additional operations:
You can restart the tunevv operation by using tunevv restart command. This starts a
tunevv_restart task.
You can completely reverse the tunevv operation by using tunevv rollback command.
This starts a tune_vv_rollback task.
For tune_vv tasks, there are three phases:
Phase 1—Storing away region move information for future restarts and/or rollbacks.
Phase 2—Performing the actual region moves.
Phase 3—Deleting the information stored in Phase 1.
The number of steps in the phase is equal to the number of regions being moved.
For more information about the tunevv command, see
NOTE: The tune_vv task type and tunevv CLI command require the HP 3PAR Dynamic
Optimization Software license.

tune_vv_restart

The tune_vv_restart task type is used to track tunevv restart operations performed with
the System Tuner tunevv restart command. The tunevv restart command enables you
to resume a failed or cancelled tunevv operation.
CAUTION:
The following examples shows how to start, cancel, and then restart a tunevv operation on virtual
volume testvol:
cli% tunevv -t r5 -ha mag testvol
Task 1 started.
134 Managing Tasks
Restart operations should not be performed on TPVVs.
"Performance Tuning" (page 173).