3PAR InFormĀ® OS 2.3.1 CLI Reference (320-200166 Rev B, March 2010)

11.86
Command Line Interface Reference InForm OS Version 2.3.1
no_one_host
This policy should only be used when exporting a VV to multiple hosts for use by a
cluster-aware application, or when
port presents VLUNs are used. This is the
default policy setting.
tp_bzero
Specifies that if a host write results in the allocation of a new data page that is only
partially filled by the host write, then a zero-fill is performed on the unwritten
portion of the data page. This ensures that the host cannot read data from deleted
volumes or snapshot. The allocation page size is 16 KB. This is the default policy
setting.
no_tp_bzero
Specifies that the zero-fill operation is bypassed on the allocation of partially
written data pages.
zero_detect
This policy enables the InServ to scan for zeros in the incoming write data. This
feature when used during physical copy to a TPVV will avoid allocating space for
blocks containing zero. This feature when used with a Thin Persistence license will
reclaim allocated space when zero blocks are written to the TPVV. This policy is only
applicable for the base TPVV.
no_zero_detect
This policy disables the InServ to scan for zeros in the incoming write data to reclaim
allocated space on the volume. This is the default policy setting.
-snp_cpg <snp_CPG>
Specifies the name of the CPG from which the snapshot space is allocated.
-snp_aw <percent>
Enables a snapshot space allocation warning. A warning alert is generated when the
snapshot space of the VV exceeds the indicated percentage of the VV size.
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.