XM Satellite Radio AA-RU5HC-TE manual Source virtual disk for this snapshot

SSSU Command Reference

■Vraid0—Provides no data protection. 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 duplication of information and provides the highest performance.

■Vraid1—Provides the highest level of data protection but uses the most space. It duplicates data written to one disk onto a backup disk. In a multidisk configuration, Vraid1 mirrors each pair of disks to each other. These disk pairs can then be striped to create a virtual disk.

■Vraid5—Provides a moderate level of data protection. This method distributes the parity information among all disk members. If one drive fails, the failed disk can be recreated after it is replaced.

VDISK=

The source virtual disk for this snapshot.

WORLD_WIDE_LUN_NAME=

Sets the World Wide LUN Name.

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

ADD SNAPSHOT wed_nite_biz VDISK="\Virtual

Disks\daily_biz\ACTIVE" ALLOCATION_POLICY=FULLY

The first example creates a snapshot payroll_backup from the ACTIVE partition of Vdisk family payroll that uses capacity only as needed.

The second example creates a snapshot wed_night_biz from the ACTIVE partition of the family daily_biz while reserving all capacity necessary to create the snapshot.

Note: To delete snapshots created by ADD SNAPSHOT, use the DELETE VDISK command.

Command View EVA Storage System Scripting Utility Reference Guide 41