Date: Fri, 13 Jun 1997 11:59:22 -0600 From: Lyndon Nerenberg <lyndon@ve7tcp.ampr.org> To: Brandon Gillespie <brandon@ice.cold.org> Cc: freebsd-questions@freebsd.org Subject: Re: dump/restore with compression Message-ID: <199706131759.LAA21305@ve7tcp.ampr.org> In-Reply-To: Your message of "Thu, 12 Jun 1997 15:40:14 MDT." <Pine.NEB.3.95.970612153906.6204A-100000@ice.cold.org>
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>>>>> "Brandon" == Brandon Gillespie <brandon@ice.cold.org> writes:
Brandon> Perhaps its how I'm executing dump, but when I run a tar
Brandon> of a filesystem, to tape, I can get the whole filesystem
Brandon> (without compression) but when I run dump, it asks for me
Brandon> to put in another tape without backing up the whole
Brandon> filesystem...
tar will run until it hits end-of-medium. dump doesn't like falling
off the end of the tape. It's defaults are for a quite small tape
capacity (i.e. something like the 145MB you can get onto a 6250BPI
9 track). You need to investigate the 'b' and 'B' options to tar,
and come up with a value that's suitable for your particular
tape drive. (I usually pick a few % under the total tape capacity.
dump requires a bit more tape space than just the number of blocks
used in the filesystem. It uses this space to write the directory
information at the front of the tape file.)
--lyndon
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