How to Determine the Number of Tapes Needed for a Full Backup

1. Become superuser or assume an equivalent role.

2. Estimate the size of the backup in bytes.

   # ufsdump [0]S file-system

   Use the S option to display the estimated number of bytes that are needed to do the backup if this is the first backup of the file system.

   Use the 0S option to display the estimated number of bytes that are needed to do the backup if this is not the first backup of the file system.

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

   For a list of tape capacities, see Table 24–5.

Example 25–2 Determining the Number of Tapes

In this example, the file system easily fits on a 150-Mbyte tape.

# ufsdump S /export/home
178176