VERITAS Volume Manager 4.1 Administrator's Guide

Administering Volumes

Monitoring and Controlling Tasks

Chapter 8 267

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 following utilities allow you to specify a tag using the -t option:

vxassist, vxevac, vxplex, vxreattach, vxrecover, vxresize, vxsd, and vxvol

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 -t myrecovery -b disk05

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.