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The mt offline command ejects media from the tape drive. This is used for
sequential mode operation as detailed above. If the robotic mechanism is in
sequential mode, it will automatically load the next tape.
C.6.2
tar
The tar command is a basic utility for writing to and reading from the tape drives.
Single files, multiple files, or entire directories can be specified. To access the on-line
man page, type man tar.
For writing, type tar cvbf 126 /dev/rmt0? {file or directory name}. Replace the
? with the desired density.
For reading, type tar xvbf 126 /dev/rmt/0 {or a file or directory name}.
To read the list of files stored on the tape, type tar tvbf 126 /dev/rm/0.
C.6.3
ufsdump
The ufsdump command provides a number of capabilities including incremental
backup and restore operations. Foremost for the tape library, the l parameter fills
each tape and then loads the next tape using of the library sequential mode. To
access the on-line man page, type man ufsdump.
The ufsdump command replaced the dump command. The dump command does not
offer the l parameter and so it is not very useful for the tape library. With the dump
command, you must provide a complex set of parameters that specify how much
capacity is to be stored on each tape. This is very difficult to use with the data
compression capable drives because the compressibility, and thus the data capacity,
can not be determined with any degree of certainty. Use the ufsdump command
instead of the dump command.
Appendix C
8 mm Tape Drive Information
C-5
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