Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

excludes disks dgrp07 and dgrp08 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 \!dgrp07 \!dgrp08
It is also possible to control how volumes are laid out on the specified storage.
See “Specifying ordered allocation of storage to volumes” on page 285.
See the vxassist(1M) manual page.
Specifying ordered allocation of storage to volumes
Ordered allocation gives you complete control of space allocation. It requires that
the number of disks that you specify to the vxassist command must match the
number of disks that are required to create a volume. The order in which you
specify the disks to vxassist is also significant.
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:
■ Concatenate disks.
■ Form columns.
■ Form mirrors.
For example, the following command creates a mirrored-stripe volume with 3
columns and 2 mirrors on 6 disks in the disk group, mydg:
# vxassist -b -g mydg -o ordered make mirstrvol 10g \
layout=mirror-stripe ncol=3 mydg01 mydg02 mydg03 mydg04 mydg05 mydg06
This command places columns 1, 2 and 3 of the first mirror on disks mydg01,
mydg02 and mydg03 respectively, and columns 1, 2 and 3 of the second mirror on
disks mydg04, mydg05 and mydg06 respectively.
Figure 7-1 shows an example of using ordered allocation to create a mirrored-stripe
volume.
285Creating volumes
Creating a volume on specific disks