Sun Cluster System Administration Guide for Solaris OS

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

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

  1. Become superuser or assume an equivalent role on the cluster node that you are backing up.

  2. Estimate the size of the backup in bytes.

    # ufsdump S filesystem 

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


    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 12–2 Determining the Number of Tapes Needed

In the following example, the file system size of 905,881,620 bytes easily fits on a 4-Gbyte tape (905,881,620 ÷ 4,000,000,000).

# ufsdump S /global/phys-schost-1