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From: 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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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?

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?