Am 27.02.2009 um 01:44 schrieb Joe Barjo: > I'd also like to test gfs for a 30 nodes cluster with sge. > Tasks are often quite short, files are also quite small. Job rate > can be quite high (can reach 10 to 20/second) > We actualy use NFS under centos4.7 and experience coherency problems. > I tested AFS, lustre, glusterFS. All showed too much overhead with > small files, and less performance than nfs. > > The coherency problem seems related to the ext3 timestamp resolution > (1 second), and the poor NFS cache system. It is not coherent even > with the noac (no attribute cache option) > > First GFS test on 6 nodes (with gnbd) were ok, but there had been > unexplained kernel panics (even when not working) that prevented > further tests. > > I will try to upgrade the cluster to a more recent distribution and > test GFS on 30 nodes. > What's your NFS-server, BTW? Rainer