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

11.75
InForm OS Version 2.3.1 Command Line Interface Reference
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.
SPECIFIERS
<usr_CPG>
Specifies the CPG name of the user space of the TPVV. If the CPG name is to be taken from
a template, this field should be (
-).
<vvname>[.<index>]
Specifies the VV name up to 31 characters in length. If the -cnt option is used,
the optional decimal number
<index> specifies the name of the first VV
(
<vvname>.<index>). The <index> is incremented by 1 for each subsequent VV. The
<index> must be an integer from 0 to 999999. All VV names have the same length
constraint.
<virtsize>[g|G|t|T]
Size for the VV in MB (maximum of 16T, minimum of 256 MB). The volume size is rounded
up to the next multiple of 32 MB. The size should be an integer. An optional suffix (with no
white space before the suffix) will modify the units to GB (
g or G suffix) or TB (t or T suffix).
If the size is to be taken from a template, this field should be (
-).
RESTRICTIONS
Use of this command requires a Thin Provisioning license. Contact your local 3PAR
representative for information.
EXAMPLES
The following example displays the creation of a TPVV named tpvv1:
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.
cli% createtpvv –aw 50 –al 75 cpg1 tpvv1 1g