Checking whether a dump is valid, and printing the dump header

To check whether a dump is valid, use the zgetdump command with the -i option.

1. Ensure that the volume is loaded.
2. Skip the first file on the tape (this is the dump tool itself):

   # mt -f /dev/ntibm0 fsf

3. Issue the zgetdump command with the -i option:

   # zgetdump -i  /dev/ntibm0

   The zgetdump command goes through the dump until it reaches the end. See also Using zgetdump to copy a tape dump.