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Date:      Thu, 26 Mar 2009 20:25:04 +1100
From:      Peter Jeremy <peterjeremy@optushome.com.au>
To:        "Daniel O'Connor" <doconnor@gsoft.com.au>
Cc:        "Mikhail T." <mi+thun@aldan.algebra.com>, freebsd-stable@freebsd.org, fs@freebsd.org
Subject:   Re: support quality (Re: dump | restore fails: unknown tape header type 1853384566)
Message-ID:  <20090326092504.GF56137@server.vk2pj.dyndns.org>
In-Reply-To: <200903251925.36108.doconnor@gsoft.com.au>
References:  <49C83673.3000604@aldan.algebra.com> <200903251820.54749.doconnor@gsoft.com.au> <49C9E635.5010106@kkip.pl> <200903251925.36108.doconnor@gsoft.com.au>

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On 2009-Mar-25 19:25:28 +1030, Daniel O'Connor <doconnor@gsoft.com.au> wrot=
e:
>One other thing would be to make absolutely sure that your version of dump=
 &=20
>restore are in sync, the are very machine/version dependent.

Actually, they aren't - the archive format is very stable.  (This is a
fairly important requirement - you don't want to suddenly be unable to
restore your backups after an upgrade).  I can restore dumps made on
FreeBSD4.8/i386 and FreeBSD4.9/alpha on a FreeBSD-current/amd64 system
without problems.

It's possible that you might have problems with a backup made using a
very recent dump on a very old restore if you've used filesystem
features that didn't exist when that restore was built.

--=20
Peter Jeremy

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