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
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