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

Chapter 8, Administering Volumes

Reattaching a DCO and DCO Volume

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This form of the command dissociates the DCO object from the volume but does not

destroy it or the DCO volume. If the -o rm option is speciﬁed, the DCO object, DCO

volume and its plexes, and any snap objects are also removed.

Note Dissociating a DCO and DCO volume disables Persistent FastResync on the

volume. A fullresynchronizationof any remainingsnapshots is requiredwhen they

are snapped back.

For more information, see the vxassist(1M) and vxdco(1M) manual pages.

Reattaching a DCO and DCO Volume

If the DCO object and DCO volume are not removed by specifying the -o rm option to

vxdco, they can be reattached to the parent volume using the following command:

# vxdco [-g diskgroup] att volume dco_obj

For example, to reattach the DCO object, myvol_dco, to the volume, myvol, use the

following command:

# vxdco -g mydg att myvol myvol_dco

For more information, see the vxdco(1M) manual page.

Adding DRL Logging to a Mirrored Volume

To put dirty region logging(DRL) intoeffect for a mirroredvolume, alog subdiskmust be

added to that volume. Only one log subdisk can exist per plex.

To add DRL logs to an existing volume, use the following command:

# vxassist [-b] addlog volume logtype=drl [nlog=n]

Note If speciﬁed, the -b option makes adding the new logs a background task.

The nlog attribute can be used tospecify thenumber of log plexesto add. By default, one

log plex is added. For example, to add a single log plex for the volume vol03, use the

following command:

# vxassist addlog vol03 logtype=drl

When the vxassist command is used to add a log subdisk to a volume, by default a log

plex is also created to contain the log subdisk unless you include the keyword nolog in

the layout speciﬁcation.