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The minimum disk size is the smallest size that is required for the successful operation of the disk staging logic.
The minimum size must be greater than or equal to the largest combined size of the backups that are placed on the storage unit between runs of the disk staging schedule. (In our example, the disk images remain on the disk for one week.)
In this example, the relocation schedule runs nightly, and the largest nightly backup is 700 MB. Symantec recommends that you double this value to allow for any problems that may occur when the relocation schedule runs. To double the value gives the administrator an extra schedule cycle (one day) to correct any problems.
To determine the minimum size for the storage unit in this example, use the following formula:
Minimum size = Max data per cycle × (1 cycle + 1 cycle for safety)