Typically, the dump-file argument specifies a raw device file for a tape device or diskette. When the ufsdump command writes to an output device, it creates a single backup file that might span multiple tapes or diskettes.
You specify a tape device or a diskette on your system by using a device abbreviation. The first device is always 0. For example, if you have a SCSI tape controller and one QIC-24 tape drive that uses medium-density formatting, use this device name:
When you specify a tape device name, you can also type the letter “n” at the end of the name to indicate that the tape drive should not rewind after the backup is completed. For example:
Use the “no-rewind” option if you want to put more than one file onto the tape. If you run out of space during a backup, the tape does not rewind before the ufsdump command asks for a new tape. For a complete description of device-naming conventions, see Backup Device Names.