This is really an wonderful article, and I can't wait to see what effect the workshop will have on ext4.
But while we wait for a production-stable fsck-friendly filesystem, we could teach MD RAID (and dm-raid for that matter) how to background scrub arrays. It is much faster to write, test and deploy such code than a new filesystem :)
Those without high-end RAID adapters and SANs (that do this by themselves) will welcome the feature, I think. I know I would...
It won't get logical errors, or save you any fsck wait. But it might avoid fscks in the first place, as it helps a great deal with IO errors due to bitrot.
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