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244 Creating volumes
Creating a volume on specific disks
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:
# vxassist [-b] [-g diskgroup] make volume length \
[layout=layout] diskname ...
For example, to create the volume volspec with length 5 gigabytes on disks
mydg03 and mydg04, use the following command:
# vxassist -b -g mydg make volspec 5g mydg03 mydg04
The 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 t5:
# 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 diskgroup attribute:
# vxassist -b make volmega 20g diskgroup=bigone bigone10 \
bigone11
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 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
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.”