Brian Ristuccia wrote:
I have a 3 disk raid5 array which recently suffered catastrophic failure of one disk. While the array was degraded, one more disk failed out of the array due to a bad block. Investigation with badblocks reveals the marginal disk has only a handful of bad blocks.
What I'd like to do is start the array with the good disk and the marginal disk, add a 3rd known good disk, and rebuild the array as best as possible. Then I'd fail the marginal disk and install another good disk.
Well, first of all - don't do anything without verifying it first.
There's a good chance you can recover quite some data if you don't screw it up by 'having a go' (I speak from experience :) )
Instead of your plan, can I suggest you try to duplicate the disk/partition showing a few bad blocks onto a known good disk.
Then forcefully reassemble the array, then add another good disk for reconstruction.
Useful tools include dd_rhelp and dd_rescue
Take a look in the archives as this kinda hit me recently. http://marc.theaimsgroup.com/?l=linux-raid&m=110025421113782&w=2
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