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

The nlog attribute specifies the number of log plexes to add. By default, one log
plex is added. The loglen attribute specifies the size of the log, where each bit
represents one region in the volume. For example, a 10 GB volume with a 64 KB
region size needs a 20K log.
For example, to add a single log plex for the volume vol03 in the disk group mydg,
use the following command:
# vxassist -g mydg addlog vol03 logtype=drl
When you use the vxassist command to add a log subdisk to a volume, a log plex
is created by default to contain the log subdisk. If you do not want a log plex,
include the keyword nolog in the layout specification.
For a volume that will be written to sequentially, such as a database log volume,
use the following logtype=drlseq attribute to specify that sequential DRL will
be used:
# vxassist -g mydg addlog volume logtype=drlseq [nlog=n]
After you create the plex containing a log subdisk, you can treat it as a regular
plex. You can add subdisks to the log plex. If you need to, you can remove the log
plex and log subdisk.
See “Removing a traditional DRL log” on page 327.
Removing a traditional DRL log
You can use the vxassist remove log command to remove a traditional DRL log
that is configured within a DRL plex. The command will not remove a DRL log
that is configured within a version 20 DCO.
327Administering volumes
Adding traditional DRL logging to a mirrored volume