Date: 14 Nov 1999 14:45:52 +0100 From: naddy@mips.rhein-neckar.de (Christian Weisgerber) To: freebsd-questions@freebsd.org Subject: Re: dump -a Message-ID: <80meeg$s8k$1@bigeye.rhein-neckar.de> References: <13D5F9EDFD72D211BC3100105A1C22330549E5@akira.lanfear.com>
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Marc Wandschneider <MarcW@Lanfear.com> wrote:
> how good is the -a switch on the dump command?
Very good. It's pretty much required for painless backups if you
want to put several archives on a single tape or have a drive with
compression.
> I've got a 12/24GB Sony 4mm SCSI DAT drive, and was wondering if
> I had to enter all the density/length commands,
That's pretty futile. If you end up having to specify the capacity
of the tape, do yourself a favor and use blocks ("-B") rather than
the arcane density/length options.
> or if the dump command would figure it out on it's own.
That's actually not a question of dump figuring it out but rather
of the tape driver properly returning a short write. sa(4) apparently
does for my Wangtek 51000HT (QIC-1000).
> Under Linux, we had no such luck,
Until rather recently, the Linux port of dump didn't support "-a"
at all. Version 0.4b9 certainly does. I don't know whether the
Linux tape driver is up to it, but using rmt on a remote host, "-a"
works.
--
Christian "naddy" Weisgerber naddy@mips.rhein-neckar.de
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