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md0 : active raid5 sdc2[5](S) sda2[4] sdd2[3](F) sdb2[1] 17510688768 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/2] [UU__]

What happend:

  1. sdc failed
  2. I have repleaced it with a new HDD
  3. Recovery stopped with some bad sectors on sdd

What I want to do is to recover as much data as possible and lose only files that are stored in bad sectors, not the whole raid.

How can I do it?

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1 Answer 1

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  • Stop the resynchronisation
  • Erase the RAID superblock from the new disk
  • Use dd_rescue to replicate the second failing drive to the new one
  • Replace this second failing one with its duplicate. If you've copied it correctly then when you restart the RAID it shouldn't notice
  • Copy off all the data you can, bearing in mind that there's still no RAID 5 parity because you're running in degraded mode, and that some of the files may have undetectable data errors, as might the filesystem
  • Rebuild the RAID array with a missing disk, recreate the filesystem
  • Copy back your validated saved data
  • Purchase a second replacement disk and add it to the rebuilt array
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