You can use any of the following to create a virtual disk:
If you create a virtual disk with a tool other than the Storage Array Configuration Wizard, you must configure the virtual disk. After you configure a virtual disk, Backup Exec uses it as a destination device for jobs. Backup Exec automatically adds configured virtual disks to the All Virtual Disks device pool.
In the Storage Array Configuration Wizard, you specify the number of virtual disks to create from the physical disks that are in the storage array. The media server cannot access the physical disks. The media server can access only the virtual disks that you create.
Backup Exec does not assign a drive letter to the virtual disk. You cannot browse for a virtual disk or access it from a command prompt. Since you cannot browse to the virtual disk, you cannot back it up with Backup Exec. Symantec recommends that you create a duplicate backup data job to move the data from the virtual disk to another device. For example, you can move the data to a tape or to another virtual disk on a separate storage array.
You can configure three low disk space thresholds for the virtual disks. As available disk space reaches each threshold, Backup Exec sends an alert. When the available disk space on the virtual disk reaches the third threshold, the alert warns you to create more disk space immediately.