Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

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

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

See “Upgrading the disk group version” on page 264.

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.

Creating volumes

Creating a volume with a version 0 DCO volume

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