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:
vxassist [-b] [-g
-b option if you want to make the volume immediately available for use.
See "Initializing and starting a volume" on page 270.
For example, to create the volume
volspec with length 5 gigabytes on disks
mydg04, use the following command:
vxassist -b -g mydg make volspec 5g mydg03 mydg04
vxassist command allows you to specify storage attributes. These give you control over the devices, including disks, controllers and targets, which
vxassist uses to configure a volume. For example, you can specifically exclude disk mydg05:
vxassist -b -g mydg make volspec 5g !mydg05
or exclude all disks that are on controller c2:
vxassist -b -g mydg make volspec 5g !ctlr:c2
or include only disks on controller
c1 except for target
vxassist -b -g mydg make volspec 5g ctlr:c1 !target:c1t5
If you want a volume to be created using only disks from a specific disk group, use the
-g option to
vxassist, for example:
vxassist -g bigone -b make volmega 20g bigone10 bigone11
or alternatively, use the
vxassist -b make volmega 20g diskgroup=bigone bigone10 \ bigone11
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
dgrp08 when calculating the maximum size of RAID-5 volume that
vxassist can create using the disks in the disk group
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 254.
If you are using VxVM in conjunction with Veritas SANPoint Control 2.0, you can specify how
vxassist should use the available storage groups when creating volumes.
See "Configuration of volumes on SAN storage" on page 78.
vxassist(1M) manual page.