Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Creating a Volume with a Version 20 DCO Volume
212 VERITAS Volume Manager Administrator’s Guide
Creating a Volume with a Version 20 DCO Volume
To create a volume with an attached version 20 DCO object and volume, use the following
procedure:
1. Ensure that the disk group has been upgraded to the latest version. Use the following
command to check the version of a disk group:
# vxdg list diskgroup
To upgrade a disk group to the most recent version, use the following command:
# vxdg upgrade diskgroup
For more information, see “Upgrading a Disk Group” on page 169.
2. Use the following command to create the volume (you may need to specify additional
attributes to create a volume with the desired characteristics):
# vxassist [-g diskgroup] make volume length layout=layout \
logtype=dco dcoversion=20 [drl=on|sequential|off] \
[ndcomirror=number] [fastresync=on] [other attributes]
Set the value of the drl attribute to on if dirty region logging (DRL) is to be used with
the volume (this is the default setting). For a volume that will be written to
sequentially, such as a database log volume, set the value to sequential to enable
sequential DRL. The DRL logs are created in the DCO volume. The redundancy of the
logs is determined by the number of mirrors that you specify using the ndcomirror
attribute.
By default, Persistent FastResync is not enabled on newly created volumes. Specify
the fastresync=on attribute if you want to enable Persistent FastResync on the
volume.
For more information, see the vxassist(1M) manual page.
Note See “Determining the DCO Version Number” on page 238 for details of how to
determine the version number of a volume’s DCO.