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

21.90
Command Line Interface Reference InForm OS Version 2.3.1
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 to ensure that the host cannot read data from deleted
volumes or snapshot. The default allocation page size is 16 KB. This is the default
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.
Multiple policies can be specified and are separated with commas. If a policy is not
specified, the policy defaults to
stale_ss.
NOTE: There can be some performance implication under extreme busy systems
so it is recommended for this policy to be turned on only during Fat to Thin and
re-thinning process and be turned off during normal operation.