HP 3PAR StoreServ 7400 4-node HP 3PAR Command Line Interface Reference (OS 3.1 - Page 156

NOTE: Thin Persistence can have some performance implications during extremely busy system conditions. HP 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. no_zero_detect This policy disables the HP 3PAR Storage System to scan for zeros in the incoming write data to reclaim allocated space on the volume. This is the default policy setting. -snp_cpg Specifies the name of the CPG from which the snapshot space is allocated. -snp_aw Enables a snapshot space allocation warning. A warning alert is generated when the reserved snapshot space of the VV exceeds the indicated percentage of the VV size. -snp_al Sets a snapshot space allocation limit. The snapshot space of the VV is prevented from growing beyond the indicated percentage of the VV size. The following options can be used when creating Thinly Provisioned Virtual Volumes (TPVVs): -tpvv Specifies that the volume should be a TPVV. -usr_aw This option enables user space allocation warning. It specifies that a warning alert is generated when the reserved user space of the TPVV exceeds the specified percentage of the VV size. -usr_al This option sets the user space allocation limit. The user space of the TPVV is prevented from growing beyond the indicated percentage of the VV size. After this size is reached, any new writes to the VV will fail. SPECIFIERS Specifies the name of the CPG from which the volume user space will be allocated. If the -tpvv option is specified, the volume is thinly provisioned. Otherwise, the volume is fully provisioned from the specified CPG. If the name of the CPG is to be taken from a template, this field should be (-). [.] Specifies a VV name up to 31 characters in length. If the -cnt option is used, the optional decimal number specifies the name of the first VV (.). The is incremented by 1 for each subsequent VV. The must be an integer from 0 through 999999. All VVs have the same length constraint. [g|G|t|T] Specifies the size for the volume in MB. The volume size is rounded up to the next multiple of 256 MB. The size should be an integer. An optional suffix (with no whitespace 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 • Access to all domains is required to run this command with logical disks specified. • Use of this command with the -tpvv option requires a Thin Provisioning license. Contact your local HP 3PAR representative for information. 156 Create Commands