Veritas Storage Foundation Intelligent Storage Provisioning 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

88 Administering application volumes

Reversing volume transformations

VxVM takes over control of I/O, and it begins to initialize the volume by

synchronizing its plexes. To view the progress of this synchronization, you

would use the

vxtask monitor command.

See the “Monitoring and Controlling Tasks” section in the “Administering

Volumes” chapter 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

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).

To stop and reverse the relayout, add column, remove column and setstwidth

operations on striped, striped-mirror and RAID-5 volumes

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 this form of the vxtask command to stop the

operation:

# vxtask abort

task_tag

3 Finally, use the vxrelayout command to revert the volume to its former

layout:

# vxrelayout [-g

diskgroup

] reverse

volume

Note: 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.