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251Creating volumes
Creating a volume with a version 0 DCO volume
# vxdg list diskgroup
To upgrade a disk group to version 90, use the following command:
# vxdg -T 90 upgrade diskgroup
For more information, see “Upgrading a disk group” on page 208.
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
For more information, see the vxassist(1M) and vxvol(1M) manual pages.
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.
For more information about ordered allocation, see “Specifying ordered
allocation of storage to volumes” on page 245 and the
vxassist(1M) manual
page.