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

Associating Subdisks with Plexes

142 VERITAS Volume Manager Administrator’s Guide

For example, to join the contiguous subdisks disk03-02, disk03-03, disk03-04 and

disk03-05 as subdisk disk03-02, use the following command:

# vxsd join disk03-02 disk03-03 disk03-04 disk03-05 disk03-02

Associating Subdisks with Plexes

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 sd=subdisk,...

Forexample, to createthe plexhome-1 and associates subdisksdisk02-01,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 plexin theorderthey are listed (after sd=).The diskspace deﬁned asdisk02-01 is

ﬁrst, disk02-00 is second,and disk02-02 is third. This methodof associatingsubdisks

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 subdisk1 [subdisk2 subdisk3 ...]

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 required if you previously created a sparse plex (that is, a plex with gaps

between its subdisks) for a particular volume, and subsequently want to make the plex

complete. To complete the plex, create a subdisk of a size that ﬁts the hole in the sparse

plex exactly. Then, associate the subdisk with the plex by specifying the offset of the

beginning of the hole in the plex, using the following command:

# vxsd -l offset assoc sparse_plex exact_size_subdisk