Hi. bcache does not have a good throttling strategy for dirty cache writeback. (I personally think the available ones are wrong.) I was forced to start writing a bash script to adjust writeback speed, so that: - When the discs have medium/low usage, the speed is reduced to a minimum. - When they have very low or zero usage, the speed is greatly increased. In this way I get the two fundamental things: - having the maximum dirty cache used (when needed). - having zero dirty cache when possible (to avoid data loss, to have more dirty cache available).
