VERITAS Volume Manager 3.1 Administrator's Guide

Volume Manager Operations
Common Volume Manager Commands
Chapter 3 137
disk4-02:1/8000, disk4-03:1/16000
sd ramd1-01 disk=ramd1 len=640
comment=”Hot spot for dbvol
plex db-02 sd=ramd1-01:40320
vol db usetype=gen plex=db-01,db-02
readpol=prefer prefname=db-02
comment=”Uses mem1 for hot spot in last 5m
This description file specifies a volume with two plexes. The first plex has
five subdisks on physical disks. The second plex is preferred and has one
subdisk on a volatile memory disk. For more information, see the vxmake
(1M) manual page.
vxplex Command
The vxplex command performs Volume Manager tasks on a plex or on
volume-and-plex combinations. The first operand is a keyword that
specifies the task to perform. The remaining operands specify the objects
to which the task is to be applied.
Use the vxplex command to:
Attach or detach a plex and a volume. A detached plex does not share
in I/O activity to the volume, but remains associated with the volume.
A detached plex is reattached when a volume is next started.
• Dissociate a plex from the associated volume. When a plex is
dissociated, its relationship to the volume is broken. The plex is then
available for other uses and can be associated with a different
volume. This is useful as part of a backup procedure.
• Copy the contents of the specified volume to the named plex(es). This
task makes a copy of a volume (for backup purposes) without
mirroring the volume in advance.
• Move the contents of one plex to a new plex. This is useful for moving
a plex on one disk to a different location.
For more information, see the vxplex (1M) manual page.
vxsd Command
The vxsd command maintains subdisk-mirror associations. Use the vxsd
command to:
• associate or dissociate a subdisk from its associated mirror