3PAR InForm® OS 2.3.1 CLI Administrator's Manual (320-200180 Rev B, February 2010)

7.10
Virtual Volume Types
3PAR InForm CLI Administrator’s Manual InForm OS Version 2.3.1
snapshot space are on a different CPGs, the user space remains available to the host if the CPG
containing the snapshot space becomes full. To save time by not repeating tasks, you can
create many identical virtual volume’s at one time. For planning information about virtual
volumes and copies of volumes, refer to the InForm OS Concepts Guide.
7.6.1 Fully-Provisioned Virtual Volumes
A fully-provisioned virtual volume is a volume that uses logical disks that belong to a logical
disk pool known as a Common Provisioning Group (CPG). Fully-provisioned virtual volumes are
the default system volume and do not require any additional licenses. Unlike Thinly-
Provisioned Virtual Volumes (TPVVs), fully-provisioned virtual volumes have a set amount of
user space allocated in the system for user data. They require the system to reserve the entire
amount of space required by the fully-provisioned virtual volume wether or not the space is
actually used. The fully-provisioned virtual volume size is fixed, and the size limit is 16 TB. You
can set snapshot space allocation limits and usage warnings to help manage the growth of
snapshot space. For detailed information about fully-provisioned virtual volumes, see the 3PAR
InForm OS Concepts Guide.
7.6.2 Thinly-Provisioned Virtual Volumes
With a 3PAR Thin Provisioning license, you can also create Thinly-Provisioned Virtual Volumes
(TPVVs). A TPVV uses logical disks that belong to a logical disk pool known as a Common
Provisioning Group (CPG). TPVVs associated with the same CPG draw user space from that pool
as needed, allocating space on demand in small increments beginning with 256 MB per
controller node. As the volumes that draw space from the CPG require additional storage, the
system automatically creates additional logical disks and adds them to the pool until the CPG
reaches the user-defined growth limit that restricts the CPG’s maximum size. The TPVV volume
NOTE: Automatic copy space reclamation is enabled by default in the 2.3.1
release of the InForm OS. If you upgraded from a previous release, the automatic
copy space reclamation is disabled. You can enable automatic copy space
reclamation with the
setsys CopySpaceReclaim <value> command. For
more information, see the InForm OS Command Line Interface Reference and
InForm CLI Help.
NOTE: Some fully-provisioned virtual volumes may be designated as a CPVV in the
3PAR InForm CLI.