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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