On 6/28/2011 7:55 AM, anderson souza wrote: > Hi everyone, > > I have an Active/Passive RHCS 6.1 runing with 8TB of GFS2 with NFS on > top and exporting 26 mouting points to 250 NFS clients. The GFS2 > mounting points are mounted with noatime, nodiratime, data=writeback and > localflocks options, and also the SAN and servers are fast (4Gbps and > 8Gb, dual controllers working in LB, H.A... QuadCore, 48GB of > memory...). The cluster has been doing its work (failover working > fine...), however and unfortunately I have seen hight I/Owait rates, > sometimes around 60-70% (on which is very bad), and a couple > of glock_workqueue jobs, so I get a bunch of gfs2_quotad, nfsd errors > and qdisk latency. The debugfs didn't show me "W", only "G" and "H". > > Have you guys seen it before? > Looks like some glock's contention? > How could I get it fixed and what does it mean? Please contact GSS and file a ticket. You are probably experiencing this: https://bugzilla.redhat.com/show_bug.cgi?id=717010 (you might not be able to see the whole content directly, but try downgrading the kernel to 6.0 should make things better) Also, given the nature of your setup, I would recommend to request a cluster architecture review to GSS for GFS2 usage in such environment. Fabio -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
