To create a volume with an attached version 0 DCO object and volume

1. Ensure that the disk group has been upgraded to at least version 90. Use the following command to check the version of a disk group:

   # vxdg list diskgroup

   To upgrade a disk group to the latest version, use the following command:

   # vxdg upgrade diskgroup

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 [ndcomirror=number] [dcolen=size] \
     [fastresync=on] [other attributes]

   For non-layered volumes, the default number of plexes in the mirrored DCO volume is equal to the lesser of the number of plexes in the data volume or 2. For layered volumes, the default number of DCO plexes is always 2. If required, use the ndcomirror attribute to specify a different number. It is recommended that you configure as many DCO plexes as there are data plexes in the volume. For example, specify ndcomirror=3 when creating a 3-way mirrored volume.

   The default size of each plex is 132 blocks unless you use the dcolen attribute to specify a different size. If specified, the size of the plex must be a multiple of 33 blocks from 33 up to a maximum of 2112 blocks.

   By default, FastResync is not enabled on newly created volumes. Specify the fastresync=on attribute if you want to enable FastResync on the volume. If a DCO object and DCO volume are associated with the volume, Persistent FastResync is enabled; otherwise, Non-Persistent FastResync is enabled.

3. To enable DRL or sequential DRL logging on the newly created volume, use the following command:

   # vxvol [-g diskgroup] set logtype=drl|drlseq volume

   If you use ordered allocation when creating a mirrored volume on specified storage, you can use the optional logdisk attribute to specify on which disks dedicated log plexes should be created. Use the following form of the vxassist command to specify the disks from which space for the logs is to be allocated:

   # vxassist [-g diskgroup] -o ordered make volume length \ 
     layout=mirror logtype=log_type logdisk=disk[,disk,...] \ 
     storage_attributes

   If you do not specify the logdisk attribute, vxassist locates the logs in the data plexes of the volume.

   See Specifying ordered allocation of storage to volumes.

   See the vxassist(1M) manual page.

   See the vxvol(1M) manual page.