Veritas Storage Foundation Intelligent Storage Provisioning 5.0.1 Administrators Guide, HP-UX 11i v3, First Edition, November 2009

See the “Monitoring and Controlling Tasks” section in the “Administering
Volumes” section of the Veritas Volume Manager Administrator’s Guide.
See the vxtask(1M) manual page.
Reversing volume transformations
If a volume transformation, which was invoked using the vxassist transform
command, is in progress, you can use the following vxassist transformreverse
command to stop and reverse the transformation:
# vxassist [-g diskgroup] transformreverse volume
This command can also be used to reverse the following operations on
mirrored-stripe volumes:
■ Adding a column to a mirrored-stripe volume (vxassist add column).
■ Removing a column from a mirrored-stripe volume (vxassist remove column).
■ Changing the stripe width of a mirrored-stripe volume (vxassist setstwidth).
When mirrors are added or removed, ISP does not use the relayout or transform
operations internally. After adding a mirror to a volume, VxVM starts
synchronizing the new plexes from the existing plexes. In this case, the reverse
operation can be performed by removing the newly added plexes. To reverse the
removal of a mirror, a new plex must be added, and time allowed for it to be brought
into synchronization with the volume.
In the following procedure, you can stop and reverse the relayout, add column,
remove column and setstwidth operations on striped, striped-mirror and RAID-5
volumes.
To reverse a volume transformation task
1
Enter the following command to discover the task tag of the operation that
you want to reverse:
# vxtask list
2
Use the task tag with the following vxtask command to stop the operation:
# vxtask abort task_tag
3
Use the vxrelayout command to revert the volume to its former layout:
# vxrelayout [-g diskgroup] reverse volume
91Administering application volumes
Reversing volume transformations