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

289Administering volumes
Performing online relayout
Specifying a non-default layout
You can specify one or more relayout options to change the default layout configuration.
Examples of these options are:
ncol=number Specifies the number of columns.
ncol=+number Specifies the number of columns to add.
ncol=-number Specifies the number of colums to remove.
stripeunit=size Specifies the stripe width.
See the
vxassist(1M) manual page for more information about relayout options.
The following are some examples of using vxassist to change the stripe width and number
of columns for a striped volume in the disk group dbaseg:
# vxassist -g dbaseg relayout vol03 stripeunit=64k ncol=6
# vxassist -g dbaseg relayout vol03 ncol=+2
# vxassist -g dbaseg relayout vol03 stripeunit=128k
The next example changes a concatenated volume to a RAID-5 volume with four
columns:
# vxassist -g fsgrp relayout vol04 layout=raid5 ncol=4
Specifying a plex for relayout
Any layout can be changed to RAID-5 if there are sufficient disks and space in the disk
group. If you convert a mirrored volume to RAID-5, you must specify which plex is to be
converted. All other plexes are removed when the conversion has finished, releasing their
space for other purposes. If you convert a mirrored volume to a layout other than RAID-5,
the unconverted plexes are not removed. You can specify the plex to be converted by
naming it in place of a volume:
# vxassist [-g diskgroup] relayout plex [layout=layout] \
[relayout_options]
Tagging a relayout operation
If you want to control the progress of a relayout operation, for example to pause or reverse
it, use the
-t option to vxassist to specify a task tag for the operation. For example, this
relayout is performed as a background task and has the tag myconv:
# vxassist -b -g fsgrp -t myconv relayout vol04 layout=raid5 \
ncol=4
See the following sections, “Viewing the status of a relayout” on page 290 and
“Controlling the progress of a relayout” on page 290, for more information about tracking
and controlling the progress of relayout.