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

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Creating and Administering Subdisks

Introduction

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) tocreatevolumes. Formoreinformation,

see “Creating a Volume” on page 161.

Use the vxmake command to create VxVM objects, such as subdisks:

# vxmake [-g diskgroup] sd subdisk diskname,offset,length

where:subdisk is thename of thesubdisk, diskname isthe disk name,offset is thestarting

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 142). Subdisks for all plex

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