VERITAS Volume Manager 4.1 Administrator's Guide

Creating Volumes

Creating a Volume on Speciﬁc Disks

Chapter 7 237

# vxassist -b make volmega 20g diskgroup=bigone disk10

disk11

NOTE Any storage attributes that you specify for use must belong to the disk

group. Otherwise, vxassist will not use them to create a volume.

You can also use storage attributes to control how vxassist uses available

storage, for example, when calculating the maximum size of a volume,

when growing a volume or when removing mirrors or logs from a volume.

The following example excludes disks disk07 and disk08 when

calculating the maximum size of RAID-5 volume that vxassist can create

using the disks in the disk group dg:

# vxassist -b -g dgrp maxsize layout=raid5 nlog=2 !disk08

See the vxassist(1M) manual page for more information about using

storage attributes. It is also possible to control how volumes are laid out

on the speciﬁed storage as described in the next section “Specifying

Ordered Allocation of Storage to Volumes” on page 237

Specifying Ordered Allocation of Storage to Volumes

If you specify the -o ordered option to vxassist when creating a volume,

any storage that you also specify is allocated in the following order:

Step 1. Concatenate disks.

Step 2. Form columns.

Step 3. Form mirrors.

For example, the following command creates a mirrored-stripe volume

with 3 columns and 2 mirrors on 6 disks:

# vxassist -b -o ordered make mirstrvol 10g

layout=mirror-stripe ncol=3 disk01 disk02 disk03 disk04

disk05 disk06