On Mon, Mar 21, 2016 at 11:42:00PM +0100, Patrick Tschackert wrote: > Based on your advice, I'll use an overlay on the array Below the array. Assemble an array of overlay disks with two missing. One of the missing disks should be that spare you synced in, because that's one of the prime suspects... actually if it was synced to it should not be the cause of mismatches, but if there are mismatches then it's likely the data that was synced to it is not good. Although RAID is able to detect mismatches, it can not tell which is the valid data and which is the invalid data so ... Definitely assemble without that disk and without each other disk in turn; so for each attempt two disks missing from your RAID-6, hopefully one of them is a bad egg and with it gone, things will look better to btrfs than they do now. The ultimate cause of those many mismatches remains a mystery. Of course you can also attempt to repair btrfs directly but if btrfs redundancy is not equal to RAID-6 then it won't be able to fix. (I think you already cleared that point on the btrfs mailing list and would not be asking here if btrfs had the magic ability to recover) Regards, Andreas -- 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
