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

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Command Line Interface Reference InForm OS Version 2.3.1
■ The following defines the volume policy:
–pol <pol>[,<pol>...]
Specifies VV policies.
stale_ss
Specifies that invalid snapshot volumes are permitted. Failure to update snapshot
data does not affect the write to the base volume, but the snapshot is considered
invalid.
no_stale_ss
Specifies that invalid snapshot volumes are not permitted. Failure to update a
snapshot is considered a failure to write to the base volume.
one_host
This constrains the export of a volume to one host or one host cluster (when cluster
names can be used as a host name).
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.