VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Administering Volumes

Adding a Mirror to a Volume

Chapter 8 259

Adding a Mirror to a Volume

A mirror can be added to an existing volume with the vxassist command,

as follows:

# vxassist [-b] [-g diskgroup] mirror volume

NOTE If speciﬁed, the -b option makes synchronizing the new mirror a

background task.

For example, to create a mirror of the volume voltest, use the following

command:

# vxassist -b mirror voltest

Another way to mirror an existing volume is by ﬁrst creating a plex, and

then attaching it to a volume, using the following commands:

# vxmake plex plex sd=subdisk ...

# vxplex att volume plex

Mirroring All Volumes

To mirror all volumes in a disk group to available disk space, use the

following command:

# /etc/vx/bin/vxmirror -g diskgroup -a

To conﬁgure VxVM to create mirrored volumes by default, use the

following command:

# /etc/vx/bin/vxmirror -d yes

If you make this change, you can still make unmirrored volumes by

specifying nmirror=1 as an attribute to the vxassist command. For

example, to create an unmirrored 20-gigabyte volume named nomirror,

use the following command:

# vxassist make nomirror 20g nmirror=1