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

By default, vxassist automatically rounds up the volume size and attribute size
values to a multiple of the alignment value. (This is equivalent to specifying the
attribute dgalign_checking=round as an additional argument to the vxassist
command.)
If you specify the attribute dgalign_checking=strict to vxassist, the command
fails with an error if you specify a volume length or attribute size value that is
not a multiple of the alignment value for the disk group.
Creating a volume on any disk
By default, the vxassist make command creates a concatenated volume that uses
one or more sections of disk space. On a fragmented disk, this allows you to put
together a volume larger than any individual section of free disk space available.
To change the default layout, edit the definition of the layout attribute defined
in the /etc/default/vxassist file.
If there is not enough space on a single disk, vxassist creates a spanned volume.
A spanned volume is a concatenated volume with sections of disk space spread
across more than one disk. A spanned volume can be larger than any disk on a
system, since it takes space from more than one disk.
To create a concatenated, default volume, use the following form of the vxassist
command:
# vxassist [-b] [-g diskgroup] make volume length
Specify the -b option if you want to make the volume immediately available for
use.
See “Initializing and starting a volume” on page 303.
For example, to create the concatenated volume voldefault with a length of 10
gigabytes in the default disk group:
# vxassist -b make voldefault 10g
Creating a volume on specific disks
VxVM automatically selects the disks on which each volume resides, unless you
specify otherwise. If you want a volume to be created on specific disks, you must
designate those disks to VxVM. More than one disk can be specified.
To create a volume on a specific disk or disks, use the following command:
283Creating volumes
Creating a volume on any disk