VERITAS Volume Manager 3.1 Administrator's Guide

Recovery

Creating RAID-5 Volumes

Chapter 8 367

\sd=disk00-01,disk01-00,disk02-00,disk03-00

Note that because four subdisks are speciﬁed with no speciﬁcation of

columns, the vxmake command assumes a four-column RAID-5 plex and

places one subdisk in each column. Striped plexes are created using this

same method. If the subdisks are to be created later, use the following

command to create the plex:

# vxmake plex raidplex layout=raid5 ncolumn=4 stwidth=32

NOTE If no subdisks are speciﬁed, the ncolumn attribute must be speciﬁed.

Subdisks can later be ﬁlled in the plex by using the vxsd assoc

command (see “Manipulating RAID-5 Subdisks”).

For example, to create a three-column RAID-5 plex using six subdisks,

use the following command:

# vxmake plex raidplex layout=raid5 stwidth=32 \

sd=disk00-00:0,disk01-00:1,disk02-00:2,disk03-00:0, \

disk04-00:1,disk05-00:2

This command stacks subdisks disk00-00 and disk03-00 consecutively

in column 0, subdisks disk01-00 and disk04-00 consecutively in

column 1, and subdisks disk02-00 and disk05-00 in column 2. Offsets

can also be speciﬁed to create sparse RAID-5 plexes, as for striped plexes.

Because log plexes are plexes without a RAID-5 layout, they can be

created normally.

To create a RAID-5 volume, specify the usage type to be RAID-5 using the

following command:

# vxmake -Uraid5 vol raidvol

RAID-5 plexes and RAID-5 log plexes can be associated implicitly using

the following command:

# vxmake -Uraid5 vol raidvol plex=raidplex,raidlog1,

raidlog2