Creating EMC disk groups for VSS differential snapshots that use EMC TimeFinder Snap

Use the following procedure.

To create EMC disk groups for VSS differential snapshots that use EMC TimeFinder Snap

Create a disk group to contain any number of primary and secondary disks.
```
symdg create nbfim_test
```
Creates a disk group named nbfim_test.
Add primary disks to the disk group.
```
symld -g nbfim_test add dev 02A
```
Adds a primary disk 02A to disk group nbfim_test.
Add a VDEV disk to the disk group.
```
symld -g nbfim_test add dev 08C -vdev
```
Adds the VDEV disk 08C to the nbfim_test disk group.
When these commands are successfully entered, NetBackup can make snapshot backups with primary device 02A and its target VDEV 08C.

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