In any production machine, I would strive very much to avoid this circumstance, yes. Better tune your system. Either allow less dirty data in the first place (d

In any production machine, I would strive very much to avoid this circumstance, yes. Better tune your system. Either allow less dirty data in the first place (dirty_background_ratio defaults to 15% of memory... even if you have 2TB of ram) or lower your dirty_writeback_centisecs so not as many seconds of dirty writes get buffered if this happening, pretty please. My example used more illustrative than real numbers. Still, 10s seems not totally uncommon, which is only 3x off.