Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

The following example command sets the comment field, and also sets tutil2 to
indicate that the subdisk is in use:
# vxedit -g mydg set comment="plex comment" tutil2="u" vol01-02
To prevent a particular plex from being associated with a volume, set the putil0
field to a non-null string, as shown in the following command:
# vxedit -g mydg set putil0="DO-NOT-USE" vol01-02
See the vxedit(1M) manual page.
293Creating and administering subdisks and plexes
Changing plex attributes