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Date: Tue, 24 Mar 2009 02:30:37 -0400
From: "Mikhail T." <mi+thun@aldan.algebra.com>
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To: "Daniel O'Connor" <doconnor@gsoft.com.au>
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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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Daniel O'Connor ΞΑΠΙΣΑΧ(ΜΑ):
> On Tuesday 24 March 2009 11:55:07 Mikhail T. wrote:
>   
>> I'm trying to migrate a filesystem from one disk to another using:
>>
>>     dump a0hCf 0 32 - /old | restore -rf -
>>
>> (/old is already mounted read-only). The process runs for a while and
>> then stops with:
>>
>>     [...]
>>       DUMP: 22.85% done, finished in 3:57 at Tue Mar 24 01:03:21 2009
>>       DUMP: 24.66% done, finished in 3:50 at Tue Mar 24 01:00:58 2009
>>       DUMP: 26.44% done, finished in 3:43 at Tue Mar 24 00:59:14 2009
>>     unknown tape header type 1853384566
>>     abort? [yn]
>>
>> Any idea, what's going on? Why can't FreeBSD's restore read FreeBSD's
>> dump's output?
>>     
>
> What happens if you don't use the cache?
>   
No big difference:

    dump a0f  - /old | restore -rf -
    [...]
      DUMP: 17.25% done, finished in 3:27 at Tue Mar 24 05:42:00 2009
      DUMP: 20.36% done, finished in 3:09 at Tue Mar 24 05:28:13 2009
      DUMP: 23.83% done, finished in 2:50 at Tue Mar 24 05:14:32 2009
    unknown tape header type -621260722
    abort? [yn]

Looks like a junk value somewhere... Unitialized variable or some such.

    -mi