VERITAS Volume Manager 3.1 Administrator's Guide

Volume Tasks
Associating Subdisks
Chapter 6282
Associating Subdisks
Associating a subdisk with a plex places the amount of disk space
defined by the subdisk at a specific offset within the plex. The entire area
that the subdisk fills must not be occupied by any portion of another
subdisk. There are several ways that subdisks can be associated with
plexes, depending on the overall state of the configuration.
If you have already created all the subdisks needed for a particular plex,
to associate subdisks at plex creation, use the following command:
# vxmake plex plex_name sd= subdisk_name ,...
For example, to create the plex home-1 and associates subdisks
disk02-01, disk02-00, and disk02-02 with plex home-1, use the
following command:
# vxmake plex home-1 sd=disk02-01,disk02-00,disk02-02
Subdisks are associated in order starting at offset 0. If you use this type
of command, you do not have to specify the multiple commands needed to
create the plex and then associate each of the subdisks with that plex. In
this example, the subdisks are associated to the plex in the order they
are listed (after sd=). The disk space defined as disk02-01 is first,
disk02-00 is second, and disk02-02 is third.
This method of associating subdisks is convenient during initial
configuration. Subdisks can also be associated with a plex that already
exists. To associate one or more subdisks with an existing plex, use the
following command:
# vxsd assoc plex_name sd_name [ sd_name2 sd_name3 ...]
For example, to associate subdisks named disk02-01, disk02-00, and
disk02-02 with a plex named home-1, use the following command:
# vxsd assoc home-1 disk02-01 disk02-00 disk02-01
If the plex is not empty, the new subdisks are added after any subdisks
that are already associated with the plex, unless the -l option is
specified with the command. The -l option associates subdisks at a
specific offset within the plex.
The -l option is needed when you create a sparse plex (that is, a plex
with a gap between its subdisks) for a particular volume, and want to
make this plex complete. To make the plex complete, create a subdisk of