Hello Stuart,
Thursday, March 1, 2007, 2:02:26 PM, you wrote:
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Heya, > SL> 1) Doing a zpool destroy on the volume > SL> 2) Doing a zpool import -D on the volume > SL> It would appear to me that primarily what has occurred is one or all of > SL> the metadata stores ZFS has created have become corrupt? Will a zpool > SL> import -D ignore metadata and rebuild using some magic foo? > It won't help. zpool import -D doesn't do anything special compared to > standard import - it just ignores flag indicating pool was destroyed. I suspected this but thought it was worth putting out there. The other thought I had was possibly doing a zpool destroy then a zpool create with half of the segments (ie. just 1 of the arrays) in the same order. Given that these are basically a concat of mirrors I wondered if this would mean that the data would at least be partially accessible. |
It's not a concat - it's rather similar to striping.
However recreating pool on halve of the mirrors won't help.
If you still hope to restore your data then DO NOT re-create
pool.
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I suspect however that the metadb would not recognise any of the files on the unit (ie. it'd simply assume it was 'null' data ready for being overwritten)? I wonder whether there's something like ext3's 'use alternate superblock'? I do assume though that if the array is already in 'FAULTED' mode ZFS has checked and concluded that all alternate copies of the metadb are corrupt? |
It's called uberblock here and during import zfs tries all valid copies automatically.
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Is it not at all possible to search for all defined files and regenerate the metadb? Utopian perhaps but I'm still completely baffled as to how on earth ZFS managed to sync corruption to our mirror. :-/ Realistically, I wouldn't be too concerned if I could at least 'mark' all parts of 1 of the arrays as 'clean' to a point where I can at least perform an import and sync as much data as possible off the array. Possible? |
It's not possible.
Your only hope now probably is some clever ZFS developer...
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Best regards,
Robert mailto:[EMAIL PROTECTED]
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