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

Use this procedure to calculate the number of tapes you will need to back up a file system.

1. Become superuser on the cluster node you want to back up.

2. Estimate the size of the backup in bytes.

   # ufsdump S filesystem

   S

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

   filesystem

   Specifies the name of the file system you want to back up.

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

Example—Determining the Number of Tapes Needed

In the following example, the file system size of 905,881,620 bytes will easily fit on a 4 GB tape (905,881,620 ÷ 4,000,000,000).

# ufsdump S /global/phys-schost-1
905881620