Hi. On Sun, 25 Jun 2017 19:54:17 +1000 John Elliot V <j...@jj5.net> wrote:
> There seems to be plenty of RAM available, and plenty of CPU. So must be > some I/O thing..? Anyway, I'm a bit stumped. I haven't tried running the > mv command with nice, because it doesn't seem to be a CPU thing... but > maybe I should..? Anyone got any ideas about how to keep my system > responsive while the mv command is processed? A known problem aka Linux 12309 bug. Try this: sysctl -w vm.dirty_ratio=5 sysctl -w vm.dirty_background_ratio=5 If it helps, put these kernel tunables into /etc/sysctl.d somewhere. Reco