Then you can mark them as bad and linux will sync to a spare.As for your sdc, I'd test it outside of the raid (dd if=/dev/sdc of=/dev/null) to see if this is a real defect or 'just' a checksum error. Then you might also try the fridge (if it's a real defect) or just ignore the error. I think there is a special "dd" version which will not abort on a read error. With that you could also clone that drive (except the failing sectors ofcourse).
I hope that helps.
----- Message from ralf@xxxxxxxx ---------
Date: Fri, 12 Oct 2007 16:42:07 +0200
From: Ralf Müller <ralf@xxxxxxxx>
Reply-To: Ralf Müller <ralf@xxxxxxxx>
Subject: RAID6 recover problem
To: linux-raid@xxxxxxxxxxxxxxx
I have a 10 disk raid6 with internal write intent bitmap here (softraid, build and managed via mdadm). For whatever reason one of the 3 promise SATA 300 TX controllers went offline and took 4 of these 10 disks with it. After reboot the array was assembled with 8 out of 10 disks - sda2 and sdb2 missing. When I tried to re-add sda2 sdc - which is one of the "active" disks - reported a read error on sector 54631. Ok - seems I have a problem. I stopped all activities at this point to ask here what I can do to reassemble the array with a minimum loss of data. Except the offline disks sda2 and sdb2 all other disks report 19 dirty chunks (mdadm -X). The offline disks report 7 dirty chunks. If one needs any further data - just ask. Hoping for assistance Ralf Müller - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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