Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Monitoring and Controlling Tasks
228 VERITAS Volume Manager Administrator’s Guide
The vxassist, vxevac, vxplex, vxmirror, vxrecover, vxrelayout, vxresize,
vxsd, and vxvol utilities allow you to specify a tag using the -t option. For example, to
execute a vxrecover command and track all the resulting tasks as a group with the task
tag myrecovery, use the following command:
# vxrecover -g mydg -t myrecovery -b mydg05
Any tasks started by the utilities invoked by vxrecover also inherit its task ID and task
tag, so establishing a parent-child task relationship.
For more information about the utilities that support task tagging, see their respective
manual pages.
Managing Tasks with vxtask
Note New tasks take time to be set up, and so may not be immediately available for use
after a command is invoked. Any script that operates on tasks may need to poll for
the existence of a new task.
You can use the vxtask command to administer operations on VxVM tasks that are
running on the system. Operations include listing tasks, modifying the state of a task
(pausing, resuming, aborting) and modifying the rate of progress of a task. For detailed
information about how to use vxtask, refer to the vxtask(1M) manual page.
VxVM tasks represent long-term operations in progress on the system. Every task gives
information on the time the operation started, the size and progress of the operation, and
the state and rate of progress of the operation. The administrator can change the state of a
task, giving coarse-grained control over the progress of the operation. For those
operations that support it, the rate of progress of the task can be changed, giving more
fine-grained control over the task.
vxtask Operations
The vxtask command supports the following operations:
abort Causes the specified task to cease operation. In most cases, the operations
“back out” as if an I/O error occurred, reversing what has been done so far to
the largest extent possible.
list Lists tasks running on the system in one-line summaries. The -l option prints
tasks in long format. The -h option prints tasks hierarchically, with child
tasks following the parent tasks. By default, all tasks running on the system
are printed. If a taskid argument is supplied, the output is limited to those
tasks whose taskid or task tag match taskid. The remaining arguments are
used to filter tasks and limit the tasks actually listed.