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280 Administering volumes
Upgrading existing volumes to use version 20 DCOs
# vxdg list diskgroup
To upgrade a disk group to the latest version, use the following command:
# vxdg upgrade diskgroup
For more information, see “Upgrading a disk group” on page 208.
2 Use the following command to discover which volumes in the disk group
have version 0 DCOs associated with them:
# vxprint [-g diskgroup] -F “%name” -e “v_hasdcolog”
Note: This command assumes that the volumes can only have version 0
DCOs as the disk group has just been upgraded. See “Determining the DCO
version number” on page 277 for a description of how to find out the DCO
version number of a volume in any disk group.
Repeat the following steps to upgrade each volume within the disk group as
required.
3 If the volume to be upgraded has a traditional DRL plex or subdisk (that is,
the DRL logs are not held in a version 20 DCO volume), use the following
command to remove this:
# vxassist [-g diskgroup] remove log volume [nlog=n]
Use the optional attribute nlog=n to specify the number, n, of logs to be
removed. By default, the
vxassist command removes one log.
4 For a volume that has one or more associated snapshot volumes, use the
following command to reattach and resynchronize each snapshot:
# vxassist [-g diskgroup] snapback snapvol
If FastResync was enabled on the volume before the snapshot was taken,
the data in the snapshot plexes is quickly resynchronized from the original
volume. If FastResync was not enabled, a full resynchronization is
performed.
5 Use the following command to turn off FastResync for the volume:
# vxvol [-g diskgroup] set fastresync=off volume
6 Use the following command to dissociate a version 0 DCO object, DCO
volume and snap objects from the volume:
# vxassist [-g diskgroup] remove log volume logtype=dco
7 Use the following command on the volume to upgrade it:
# vxsnap [-g diskgroup] prepare volume [ndcomirs=number] \
[regionsize=size] [drl=on|sequential|off] \
[storage_attribute ...]
The ndcomirs attribute specifies the number of DCO plexes that are
created in the DCO volume. It is recommended that you configure as many
DCO plexes as there are data and snapshot plexes in the volume. The DCO
plexes are used to set up a DCO volume for any snapshot volume that you