Am 13. April 2012 11:42 schrieb Brian Candler <B.Candler at pobox.com>: > On Fri, Apr 13, 2012 at 11:25:58AM +0200, Philip wrote: > > Sometimes the io-latency skyrockets and there is no > > access possible on the raid for >10 seconds. > > Have you checked > http://community.gluster.org/a/linux-kernel-tuning-for-glusterfs/ > ? > > If you have a large amount of RAM and a lot of writes, maybe you're > accumulating large amounts of dirty data which is then being synchronously > flushed. > I indeed have lots of ram but I've disabled all write access for a few hours to check if this issue is write related. These latency spikes did also happen when there were no writes at all. I haven't changed these values. They were at vm.dirty_background_ratio = 10 vm.dirty_ratio = 20 I've changed it to vm.dirty_background_ratio = 2 vm.dirty_ratio = 10 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gluster.org/pipermail/gluster-users/attachments/20120413/2f1f6c59/attachment.htm>
