VERITAS Volume Manager 4.1 Administrator's Guide

Creating and Administering Subdisks
Creating Subdisks
Chapter 5 199
Creating Subdisks
NOTE Subdisks are created automatically if you use the vxassist command or
the VERITAS Enterprise Administrator (VEA) to create volumes. For
more information, see “Creating a Volume” on page 228.
Use the vxmake command to create VxVM objects, such as subdisks:
# vxmake [-g diskgroup] sd subdisk diskname,offset,length
where: subdisk is the name of the subdisk, diskname is the disk name,
offset is the starting point (offset) of the subdisk within the disk, and
length is the length of the subdisk.
For example, to create a subdisk named disk02-01 that starts at the
beginning of disk disk02 and has a length of 8000 sectors, use the
following command:
# vxmake sd disk02-01 disk02,0,8000
NOTE As for all VxVM commands, the default size unit is s, representing a
sector. Add a suffix, such as k for kilobyte, m for megabyte or g for
gigabyte, to change the unit of size. For example, 500m would represent
500 megabytes.
If you intend to use the new subdisk to build a volume, you must
associate the subdisk with a plex (see “Associating Subdisks with Plexes”
on page 204). Subdisks for all plex layouts (concatenated, striped,
RAID-5) are created the same way.