System Administration Guide, Volume 1

How to Determine the Number of Tapes for a Full Backup

  1. Become superuser.

  2. Estimate the size of the backup in bytes by using the usfdump S command.

    # ufsdump S filesystem


    Displays the estimated number of bytes needed to do the backup. 

  3. Divide the estimated size by the capacity of the tape to see how many tapes you need.

    See Table 42-2 for a list of tape capacities.

Example--Determining Number of Tapes

In this example, the file system of 489,472 bytes will easily fit on a 150-Mbyte tape.

# ufsdump S /export/home