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Date: Tue, 24 Mar 2009 21:18:56 -0400
From: "Mikhail T." <mi+thun@aldan.algebra.com>
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To: Andrew Snow <andrew@modulus.org>
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Cc: freebsd-stable@freebsd.org, fs@freebsd.org
Subject: Re: dump | restore fails: unknown tape header type 1853384566
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Andrew Snow ΞΑΠΙΣΑΧ(ΜΑ):
> Mikhail T. wrote:
>>    dump 0aCf 64  /ibm/ibmo.0.2009-03-24.dump /old
>>      DUMP: WARNING: should use -L when dumping live read-write 
>> filesystems!
>
> I thought you said it was a read-only filesystem?
It was yesterday. Today I remounted it rw to remove some junk-files, 
which I don't need to transfer. I don't believe, this is causing the 
problems.
> In my experience, restore can sometimes throw warnings if you dump a 
> live filesystem.  It might be causing your errors?  If possible, can 
> you try completely unmounting the filesystem you are dumping and 
> trying again?
I don't think, restore can even figure this out, much less throw a 
warning -- it is dump, that complains... But the dump started this 
morning is still hanging (in sbwait) -- I've never seen this before. I'm 
also very troubled, that such an important functionality (dump/restore!) 
is sooo problem-prone, and yet so few people seem to care...

Is the official view, that dump is obsolete (and already bit-rotten), 
perhaps, and use of tar is encouraged instead?

    -mi