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The stupid and time consuming method: For each disk, assemble the RAID with that disk missing, and mount it. Compare all the files of those mounts; if you find any difference in any of the files, that's your mismatch. Do this in a rescue system, where your RAID is not running. To make sure no changes are made to the RAID members themselves, create ...


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In the case of raid5, there is no alternate data; it simply means the checksum does not match. Write repair to /sys/block/md0/md/sync_action to scan the array and recompute any mismatching checksums.



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