HP 3PAR User's Guide download pdf (Page 345)

Specifies that the volume snapshot space is to be provisioned from the specified CPG. This option

moves all the logical disks currently contained in the snapshot space for these volumes into the

CPG. This is permitted only when none of the logical disks are shared with other volumes that are

not specified in this option. If the <snp_CPG> specifier is specified as "", the volume snapshot

space is longer provisioned from a CPG and the existing snapshot space logical disks are removed

from the CPG. This is permitted only when the existing snapshot logical disks are exclusively used

by the volumes specified in this option.

-snp_aw <percent>

NOTE: The operation of setting a snapshot space CPG for a tpsd volume (a TPVV created with

HP 3PAR OS 2.2.4 or earlier) is not permitted if the volume has existing snapshots. All existing

snapshots must first be removed before using this option.

Indicates a snapshot space allocation warning. Through this option you can generate a warning

alert when the reserved snapshot space of the virtual volume exceeds the indicated percentage

of the virtual volume size.

-snp_al <percent>

Indicates a snapshot space allocation limit. The snapshot space of the virtual volume is prevented

from growing beyond the indicated percentage of the virtual volume size.

–pol <policy>[,<pol>...]

Specifies the policy is implemented by a virtual volume. Valid policies are as follows:

• stale_ss - Specifies that invalid (stale) snapshot volumes are permitted. Failures to update

snapshot data occur when there is not sufficient administration or snapshot space. Failures to

update snapshot data does not affect the write to the base volume. However, the snapshot is

considered invalid.

• no_stale_ss - Specifies that stale snapshot volumes are not permitted. A failure to update

a snapshot is considered a failure to write to the base volume. Existing stale snapshots remain

stale.

• one_host - Constrains the export of a volume to one host or one host cluster (when cluster

names may be used as a host name).

• no_one_host - This policy should only be used when exporting a virtual volume 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 to ensure that the host cannot read data from deleted volumes or snapshot. The

default allocation page size is 16 KB.

• no_tp_bzero - Specifies that the zero-fill operation is bypassed on the allocation of partially

written data pages.

• zero_detect - Enables the HP 3PAR storage system to scan for zeros in the incoming write

data. When used during a physical copy to a Thinly Provisioned Virtual Volume (TPVV) avoids

allocating space for blocks containing zero. When used with a Thin Persistence license,

reclaims allocated space when zero blocks are written to a TPVV. This policy is applicable

for base TPVVs.

• no_zero_detect - Disables the HP 3PAR storage system to scan for zeros in the incoming

write data to reclaim allocated space on the volume.

Multiple policies can be specified and are separated with commas. If a policy is not specified, the

policy defaults to stale_ss.

The following options can only be used on Thinly Provisioned Virtual Volumes (TPVVs):

-usr_aw <percent>

setvv 345

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Electrolux Nimble Manuel de l'utilisateur (16 pages)

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Table des matières

OWNERS GUIDE

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