Zeroing Unused Space; Creating A Physical Copy; Hp 3Par Thin Persistence Software; Hp 3Par Thin Copy Reclamation Software - HP 3PAR StoreServ 7200 2-node Manual

Zeroing Unused Space

Use a host application to write zeros to the allocated but unused volume space. F-Class, T-Class,
StoreServ 10000, and StoreServ 7000 Storage systems detect and discard the zeros during the
volume copy operation.

Creating a Physical Copy

After writing zeros to the allocated but unused space, the source volume is ready for the final phase
of conversion. You create a TPVV physical copy of the source volume to convert the source volume
to a TPVV. When you create a physical copy, F-Class, T-Class, StoreServ 10000, and StoreServ
7000 Storage systems automatically detect the zeros and do not allocate space for them in the
physical copy. The result is a TPVV that is much smaller than the original volume.
Thin Conversion tasks can be performed with both the HP 3PAR Command Line Interface (CLI) and
the HP 3PAR Management Console. See the HP 3PAR Command Line Interface Administrator's
Manual and the HP 3PAR Management Console Online Help for instructions on how to perform
these tasks.
NOTE: Converting fully-provisioned volumes to Thinly-Provisioned Virtual Volumes (TPVVs) with
the Thin Conversion feature requires an F-Class, T-Class, StoreServ 10000, or StoreServ 7000
Storage system, an HP 3PAR Thin Provisioning license, and an HP 3PAR Thin Conversion license.
Contact your HP representative for more information.

HP 3PAR Thin Persistence Software

HP 3PAR Thin Persistence software is an optional feature that keeps TPVVs and read/write snapshots
of TPVVs small by detecting pages of zeros during data transfers and not allocating space for the
zeros. This feature works in real-time and analyzes the data before it is written to the source TPVV
or read/write snapshot of the TPVV. Freed blocks of 16 KB of contiguous space are returned to
the source volume, freed blocks of 128 MB of contiguous space are returned to the CPG for use
by other volumes.
To use Thin Persistence functions, you must have an F-Class, T-Class, StoreServ 10000, or StoreServ
7000 Storage system. The Thin Persistence feature is automatically enabled on F-Class, T-Class,
StoreServ 10000, and StoreServ 7000 Storage systems. Thin Persistence tasks can be performed
with both the HP 3PAR Command Line Interface (CLI) and the HP 3PAR Management Console.
Refer to the HP 3PAR Command Line Interface Administrator's Manual and the HP 3PAR
Management Console Online Help for instructions on how to perform these tasks.
NOTE: Maintaining TPVV and read/write snapshot size with the Thin Persistence feature requires
an F-Class, T-Class, StoreServ 10000, or StoreServ 7000 Storage system, an HP 3PAR Thin
Provisioning license, an HP 3PAR Thin Conversion license, and an HP 3PAR Thin Persistence license.
Contact your HP representative for more information.

HP 3PAR Thin Copy Reclamation Software

HP 3PAR Thin Copy Reclamation software is an optional feature that reclaims space when snapshots
are deleted from a system. As snapshots are deleted, the snapshot space is reclaimed from a
Thinly-Provisioned Virtual Volume (TPVV) or fully-provisioned virtual volume and returned to the
CPG for reuse by other volumes. Deleted snapshot space can be reclaimed from virtual copies,
physical copies, or remote copies. The HP 3PAR Thin Copy Reclamation feature works on any
class of system. The HP 3PAR OS automatically reclaims snapshot space if the HP 3PAR Virtual
Copy, HP 3PAR Remote Copy, or HP 3PAR Thin Provisioning license is enabled. For more
information about snapshots, see
NOTE: Reclaiming space when snapshots are deleted with the HP 3PAR Thin Copy Reclamation
feature requires the HP 3PAR Virtual Copy, HP 3PAR Remote Copy, or HP 3PAR Thin Provisioning
license. Contact your HP representative for more information.
56 Enhanced Storage Applications
"Virtual Copy Snapshots" (page 9).