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Date:      Fri, 14 Sep 2012 11:35:41 +0300
From:      Volodymyr Kostyrko <>
To:        =?UTF-8?B?IlRob21hcyBHw7ZsbG5lciAoTmV3c2xldHRlciki?= <>
Subject:   Re: 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:  <>
In-Reply-To: <000001cd9239$ed734c80$c859e580$>
References:  <001a01cd900d$bcfcc870$36f65950$> <> <000a01cd90aa$0a277310$1e765930$> <> <000001cd9239$ed734c80$c859e580$>

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14.09.2012 08:29, Thomas Göllner (Newsletter) wrote:
> Thanks for the code. It helped a little bit to understand some details.
> I tried the "-e" Option of "zdb" and I listed the uberblocks of the discs with "zdb -l -u <dev>".
> As I can see, the there is a "create_txg: 56482". With the uberblocks I was able to find the corresponding date/time which is the time I added the new vdev.
> But every command and option combo I'm trying gets me just two results:
> "Input/output error" or
> "Device not configured"
> So I can't read out data via "-bbb" or so...
> Perhaps there was more destroyed during the process of creating and adding the new vdev than I thought first. It seems to me, that the NAS4free GUI mixed up the discs during formatting or something like that. After adding the new vdev I hat 16TB of space which was way too much and in the info I could see the discs of the old vdev twice... But the NAS was still playing out my data. After the restart the pool faulted.
> So my last idea is the "-C" option of the "zdb" command. Perhaps I can give a new config which it has to use. But where do I find the config file or what is it supposed to look like?

Try reading Max Bruning's blog at, there's 
a good data walk on raidz and raidz on-disk format.

> 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.

Sphinx of black quartz judge my vow.

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