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Date:      Sat, 15 Sep 2012 21:25:49 +0200
From:      =?utf-8?Q?Thomas_G=C3=B6llner_=28Newsletter=29?= <Newsletter@goelli.de>
To:        "'Volodymyr Kostyrko'" <c.kworr@gmail.com>
Cc:        freebsd-fs@freebsd.org
Subject:   AW: AW: AW: AW: ZFS: Corrupted pool metadata after adding vdev to a pool - no opportunity to rescue data from healthy vdevs? Remove a vdev? Rewrite metadata?
Message-ID:  <000001cd9377$e9e9b010$bdbd1030$@goelli.de>
In-Reply-To: <505322C9.70200@gmail.com>
References:  <001a01cd900d$bcfcc870$36f65950$@goelli.de> <504F282D.8030808@gmail.com> <000a01cd90aa$0a277310$1e765930$@goelli.de> <5050461A.9050608@gmail.com> <000001cd9239$ed734c80$c859e580$@goelli.de> <5052EC5D.4060403@gmail.com> <000a01cd9274$0aa0bba0$1fe232e0$@goelli.de> <505322C9.70200@gmail.com>

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>>> Try reading Max Bruning's blog at http://mbruning.blogspot.com/, =
there's a good data walk on raidz and raidz on-disk format.
>>
>> I'll do that, thanks for pointing me to it.

Ok... I did read some of it. And I understand so much that I see, that =
what I want is possible, but far beyond my skills.

>>>> I also think there is no way to write new or edit the lables of the =
discs?
>>>
>>> This idea is called Block Pointer Rewrite and is not implemented =
yet. I have found no code to do that.
>>
>> I thought it may come to this -.- Because during my last reading I =
had to learn, that I have to find the "root block pointer" to recover =
the maybe overwritten labels... As it changes place and content with =
each copy on write process (each txg?) it will be a search for the =
needle in the haystack...
>
> Not at all, what are you referring to is MOS and the one is contained =
in each UberBlock.

So as this thing is so far beyond my skills, I am sad to point out that =
I have to give up here. Without someone who will take me by the hand and =
say what to do step by step I think recovering/rewriting the right =
labels of my discs is something I will not be able to do within one year =
or so. It's a pity that ZFS still has no tools for recovering metadata =
built in. This would be a task to think of in future.

Thanks again for your help Volodymyr. It is a bit of consolation that at =
least I know now that I have done everything I could.




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