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268 Administering volumes
Monitoring and controlling tasks
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.
monitor Prints information continuously about a task or group of tasks as
task information changes. This allows you to track the progression
of tasks. Specifying -l causes a long listing to be printed. By
default, short one-line listings are printed. In addition to printing
task information when a task state changes, output is also