VERITAS Volume Manager 4.1 Administrator's Guide

Creating Volumes
Mirroring across Targets, Controllers or Enclosures
Chapter 7250
Mirroring across Targets, Controllers or
Enclosures
To create a volume whose mirrored data plexes lie on different
controllers, you can use either of the commands described in this section.
# vxassist [-b] [-g diskgroup] make volume length
layout=layout mirror=target [attributes]
NOTE Specify the -b option if you want to make the volume immediately
available for use. See “Initializing and Starting a Volume” on page 258
for details.
The attribute mirror=target specifies that volumes should be mirrored
between identical target IDs on different controllers.
# vxassist [-b] [-g diskgroup] make volume length
layout=layout mirror=ctlr [attributes]
The attribute mirror=ctlr specifies that disks in one mirror should not be
on the same controller as disks in other mirrors within the same volume.
NOTE Both paths of an active/passive array are not considered to be on
different controllers when mirroring across controllers.
The following command creates a mirrored volume with two data plexes:
# vxassist -b make volspec 10g layout=mirror nmirror=2
mirror=ctlr ctlr:c2 ctlr:c3
. This arrangement ensures continued availability of the volume should
either controller fail.
The attribute mirror=enclr specifies that disks in one mirror should not
be in the same enclosure as disks in other mirrors within the same
volume.
The following command creates a mirrored volume with two data plexes: