Veritas Storage Foundation Intelligent Storage Provisioning 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

63Creating application volumes
Determining the maximum volume size
hot-relocation or volume transformation taking place if disks with the same
product ID are not available.
For a single invocation of the vxassist command, you can override the default
values of attributes that are defined in the /etc/default/allocator file, or
that are built into
vxassist, by specifying them as comma-separated arguments
to the
-o option.
Determining the maximum volume size
Before creating a volume, you may wish to check whether there is sufficient
storage available. You can use the following command to determine the
maximum size of a volume with a given capability that you can create in the data
storage pool of a disk group:
# vxassist [-g diskgroup ] [-P storage_pool ] [-b] maxsize \
[
storage_specification ] [ attribute = value ...]
Specify the -b option if you want to run this command in the background.
Otherwise, it will block until it has completed its calculation of the maximum
volume size.
Note: The storage that is available for allocation is based on the setting of the
AutoGrow policy on a storage pool. If the value of this policy is set to
diskgroup and not to pool, all suitable disks in the disk group are used in the
calculation. You can use the
-P option to specify that only storage from the
specified pool is to be considered.
For example, the following command returns the maximum possible size of a
mirrored volume with 3 mirrors that can be created from all the available free
storage:
# vxassist -g mydg -P mypool maxsize layout=mirror nmir=3
This is the equivalent command if the DataMirroring capability is specified:
# vxassist -g mydg -P mypool maxsize \
capability=’DataMirroring(nmirs=3)’
The next example checks for the maximum volume size that can be created
using prefabricated mirrors of a specified vendor type:
# vxassist -g peakdg -P peakpool maxsize \
volume_template=PrefabricatedDataMirroring \
rules=’confineto "VendorName"="ACME"’
Note: The maximum size of a VxVM volume that you can create is 256TB.