HP StorageWorks Storage System Scripting Utility reference (September 2005)

NOTE:

Creating snapshots of virtual disks depends on your licensing. Attempting to add a snapshot without

the license returns an error message. This message indicates that you need to enter your licensing

informationintheHPCommandViewEVA.Youmusthavearegisteredlicense.

Syntax

ADD SNAPSHOT <snapshot_name> VDISK=<vdisk_to_snapshot>

Required switch

The following switch is required with the ADD SNAPSHOT command:

VDISK=

Examples

ADD SNAPSHOT payroll_backup VDISK="\Virtual Disks\payroll\ACTIVE"

ALLOCATION_POLICY=DEMAND

This example creates a snapshot payroll_backup from the ACTIVE member of virtual disk family

payroll that uses capacity only as needed.

ADD SNAPSHOT wed_nite_biz VDISK=daily_biz ALLOCATION_POLICY=FULLY

This example creates a snapshot wed_night_biz from the ACTIVE mem ber of the family daily_biz

while reserving all capacity necessary to create the snapshot.

NOTE:

To delete snapshots cr eated by ADD SNAPSHOT, use the DELETE VDISK command.

Switches

The following switches are available with the AD D SNAPSHOT command.

ALLOCATION_POLICY=

Indicates how the space for the snapshot is allocated.

• DEMAND—Sto

rage is allocated for the snapshot only when required. As the snapshot and the

original st

orage’s information diverges, the space allocated for the snapshot incre ases.

• FULLY—All storage required to fully contain a snapshot is allocated when the snapshot is created.

This is the conser vative m ethod to create a snapshot, because adequate space is guaranteed for

a full snapshot. This is the default.

OS_UNIT_ID=

The ID that is presented to the h ost operating system. If set to zero, no ID is presented to the host.

REDUNDAN

CY=

The amount of data protection set when creating the virtual disk. If not speciﬁed, the default is the

setting of the source virtual disk.

• Vraid0—Provides no data p rotection. It distributes data among its member disks into stripes

and uses all members to process I/O requests. This method has no overhead associated with

duplica

tion of information and prov ides the highest performance.

Utility command reference