VanLUG Email Archive
Brian Edmonds (brian@gweep.bc.ca)
Mon, 18 Jan 1999 09:37:14 -0800
Harondel J Sibble <help@pdscc.com> writes:
> so... how much scratch/temp space does a tar operation to tape need?
> as much as the original file sizes? a lot smaller? half as much?
If you're creating the tar file on disk, then dumping it to tape, you'll
need as much room as the tar file takes. If you're dumping straight to
tape, then it should not use any space on disk, as everything's done in
memory.
> so as the cororally how does one put multiple tgz files on the tape?
> by using /dev/nst0? then just write tar after tar until the tape is
> full?
That's exactly right. You can also use various mt commands to move
around on the tape. The "file" structure of a tape looks like:
file eof file eof ... file eof eof
The end of the tape is denoted by the two consecutive end-of-file tags.
Most tape devices will handle this automagically for you, but mt is
capable of writing eof tags manually if necessary.
> other than not rewinding what is the (dis)advantage of using the
> rewinding device over the non-rewinding device?
Except for that detail, they're exactly the same.
Brian.
This archive was generated by hypermail 2.0b3 on Mon 18 Jan 1999 - 09:38:26 PST