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I see you closed the review. However don't stop working with that problem.. It's still something that a worth a solution, even if not exactly That solution. Maybe a generic idea through the block IO layer of transaction requirements. We did face this issue in a BSD4.3 variant in 1990 where a single disk error would result in a cascading shockwave of slowdowns that took some time to resolve. The issue even comes up in networking too, especially with realtime video where "don't bother, we missed the window" comes into play.