Veritas Storage Foundation Intelligent Storage Provisioning 5.0.1 Administrators Guide, HP-UX 11i v3, First Edition, November 2009

The file, /etc/default/allocator_readme, contains a copy of the defaults file
as it is shipped and first installed.
By default, the attribute settings in the installed /etc/default/allocator file
are commented out. If required, you can uncomment the entries, and edit their
values. If you do this, you should first make a backup copy of the original unedited
file to keep for reference.
The following entry for default_rules in the /etc/default/allocator file is
commented out by default:
# default_rules=desired confineto "ProductId"
If enabled, this rule changes the default behavior of ISP so that it attempts to
confine volumes to disks with the same product ID. The rule may also prevent
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.
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.
63Creating application volumes
Determining the maximum volume size