VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Dissociating Subdisks from Plexes

144 VERITAS Volume Manager Administrator’s Guide

For example, to associate a subdisk named disk02-01 with a plex named vol01-02,

which is already associated with volume vol01, use the following command:

# vxsd aslog vol01-02 disk02-01

You can also add a log subdisk to an existing volume with the following command:

# vxassist addlog volume disk

This command automatically creates a log subdisk within a log plex on the speciﬁed disk

for the speciﬁed volume.

Dissociating Subdisks from Plexes

To break an established connection between a subdisk and the plex to which it belongs,

the subdisk is dissociated from the plex. A subdisk is dissociated when the subdisk is

removed or used in another plex. To dissociate a subdisk, use the following command:

# vxsd dis subdisk

For example, to dissociate a subdisk named disk02-01 from the plex with which it is

currently associated, use the following command:

# vxsd dis disk02-01

You can additionally remove the dissociated subdisks from VxVM control using the

following form of the command:

# vxsd -o rm dis subdisk

Caution If thesubdisk mapsa portion of a volume’saddress space, dissociating it places

the volume in DEGRADED mode. In this case, the dis operation prints a

warning and must be forced using the -o force option to succeed. Also, if

removing the subdisk makes the volume unusable, because another subdisk in

the same stripe is unusable or missing and the volume is not DISABLED and

empty, the operation is not allowed.

Removing Subdisks

To remove a subdisk, use the following command:

# vxedit rm subdisk

For example, to remove a subdisk named disk02-01, use the following command:

# vxedit rm disk02-01