Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

259Administering volumes
Monitoring and controlling tasks
DISABLED volume kernel state
The volume is offline and cannot be accessed.
ENABLED volume kernel state
The volume is online and can be read from or written to.
Monitoring and controlling tasks
Note: VxVM supports this feature for private disk groups, but not for shareable disk
groups in a cluster environment.
The VxVM task monitor tracks the progress of system recovery by monitoring task
creation, maintenance, and completion. The task monitor allows you to monitor task
progress and to modify characteristics of tasks, such as pausing and recovery rate (for
example, to reduce the impact on system performance).
Specifying task tags
Every task is given a unique task identifier. This is a numeric identifier for the task that
can be specified to the
vxtask utility to specifically identify a single task. Several VxVM
utilities also provide a -t option to specify an alphanumeric tag of up to 16 characters in
length. This allows you to group several tasks by associating them with the same tag.
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.