Le 18/12/2012 10:30, Andreas Kurz a écrit :
That's quite a lot ... you also tuned vm.dirty_background_bytes and
vm.dirty_bytes to a reasonable low value? .... to avoid regular heavy
data write-out.... Regards, Andreas
I'd look into this too, although with the given config and the default
10% threshold for background writes of dirty pages, it should kick in
for ~12 Gbytes of dirty. Let's say 120 Gbits get sent over the 20Gb/s
link, that clean all up in a few seconds shouldn't it ?
I hope I'm not just adding noise, but if the kernel is old enough, there
are cases where the write load is high enough for a sync operation to
never end. Maybe that affects you?
In any case, it's worth running a "watch grep dirty /proc/vmstat" while
the i/o block : if the cleaner is kicking in, nr_dirty should decrease
down to almost zero. If it goes down an up again and again, maybe the
write load is too high for a sync() to finish.
Lionel Sausin
_______________________________________________
drbd-user mailing list
[email protected]
http://lists.linbit.com/mailman/listinfo/drbd-user
