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

7.16
Reducing Volume Size with 3PAR Thin Persistence
3PAR InForm CLI Administrator’s Manual InForm OS Version 2.3.1
7.12 Reducing Volume Size with 3PAR Thin Persistence
3PAR Thin Persistence is an optional feature keeps InServ TPVVs small by detecting pages of
zeros during data transfers, and not allocating space for the zeros in the destination TPVV. This
feature works in real-time and analyzes the data before it is written to the destination TPVV.
You must have an InServ F-Class or T-Class Storage Server to use Thin Persistence with TPVVs.
For more information about the 3PAR Thin Persistence feature, refer to the InForm OS
Concepts Guide.
To enable the 3PAR Thin Persistence feature on a TPVV, use the
setvv command to enable the
zero_detect policy on the destination TPVV. For more information, see 7.9 Modifying Virtual
Volumes on page 7.13.
7.13 Managing Virtual Volume Autonomic Groups
Virtual volume sets are part of the Autonomic Groups feature. Virtual volumes can be
combined into autonomic groups, which are sets that can be managed as one object. If you
have a group of volumes used by a database or an other application and all the virtual volumes
require the same administrative procedures, it is easier to group those volumes into a set and
manage them together. Individual virtual volumes can be members of multiple virtual volume
sets.
Virtual volumes added to a set inherit the privileges of that set. For example, If a group of
virtual volumes is exported to a host and a new virtual volume is added to the virtual volume
set, the new virtual volume is visible to the host as soon as it is added to the virtual volume set.
NOTE: Thin Persistence can have some performance implications during
extremely busy system conditions. 3PAR recommends the
zero_detect policy
only be enabled during Thin Persistence and Thin Conversion operations. The
zero_detect policy should be disabled during normal operation.
NOTE: Maintaining TPVV size with the 3PAR Thin Persistence feature requires an
InServ F-Class or T-Class Storage Server, a 3PAR Thin Provisioning license, a 3PAR
Thin Conversion license, and a 3PAR Thin Persistence license. Contact your 3PAR
representative for more information.