Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

To view the details of the DCO object and DCO volume that are associated with a
volume, use the vxprint command. The following is example vxprint -vh output
for the volume named vol1 (the TUTIL0 and PUTIL0 columns are omitted for
clarity):
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE ...
v vol1 fsgen ENABLED 1024 - ACTIVE
pl vol1-01 vol1 ENABLED 1024 - ACTIVE
sd disk01-01 vol1-01 ENABLED 1024 0 -
pl foo-02 vol1 ENABLED 1024 - ACTIVE
sd disk02-01 vol1-02 ENABLED 1024 0 -
dc vol1_dco vol1 - - - -
v vol1_dcl gen ENABLED 132 - ACTIVE
pl vol1_dcl-01 vol1_dcl ENABLED 132 - ACTIVE
sd disk03-01 vol1_dcl-01 ENABLED 132 0 -
pl vol1_dcl-02 vol1_dcl ENABLED 132 - ACTIVE
sd disk04-01 vol1_dcl-02 ENABLED 132 0 -
In this output, the DCO object is shown as vol1_dco, and the DCO volume as
vol1_dcl with 2 plexes, vol1_dcl-01 and vol1_dcl-02.
If you need to relocate DCO plexes to different disks, you can use the vxassist
move command. For example, the following command moves the plexes of the
DCO volume, vol1_dcl, for volume vol1 from disk03 and disk04 to disk07 and
disk08.
Note: The ! character is a special character in some shells. The following example
shows how to escape it in a bash shell.
# vxassist -g mydg move vol1_dcl \!disk03 \!disk04 disk07 disk08
See “Moving DCO volumes between disk groups” on page 232.
See the vxassist(1M) manual page.
See the vxsnap(1M) manual page.
Using a DCO and DCO volume with a RAID-5 volume
You can add a DCO and DCO volume to a RAID-5 volume. This lets you use
Persistent FastResync on the volume for fast resynchronization of snapshots on
returning them to their original volume. However, this procedure has the side
effect of converting the RAID-5 volume into a special type of layered volume. You
can create space-optimized instant snapshots of such a volume, and you can add
Administering volumes
Preparing a volume for DRL and instant snapshots
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