Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

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Creating and Administering Subdisks

This chapter describes how to create and maintain subdisks. Subdisks are the low-level

building blocks in a VERITAS Volume Mananger (VxVM) configuration that are required

to create plexes and volumes.

Note Most VxVM commands require superuser or equivalent privileges.

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 198.

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 mydg02-01 in the disk group, mydg, that starts at

the beginning of disk mydg02 and has a length of 8000 sectors, use the following

command:

# vxmake -g mydg sd mydg02-01 mydg02,0,8000

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 178). Subdisks for all plex

layouts (concatenated, striped, RAID-5) are created the same way.