Just to clarify, we are using the native kNFS-server from the distro, not gluster's NFS implementation. Note that CentOS 5.7/5.8 does not seem to support this kind of loopback mounting with the kNFS version they use (kNFS ver 1.0.8/9). However, the recent kNFS servers from Ubuntu/Debian (kNFSv 1.2.0) and SL 6.2 (1.2.3) do support it. We're still testing but have not yet found the kind of deadlocks/crashes that others have mentioned with the gluster NFS (touch wood). hjm On Monday, September 17, 2012 09:08:08 AM Jeff White wrote: > I was under the impression that self-mounting NFS of any kind (mount -t > nfs localhost...) was a dangerous thing. When I did that with gNFS I > could cause a server to crash in no time at all with a simple dd into > the mount point. I was under the impression that kNFS would have the > same problem though I have not tested in myself (this was discussed in > #gluster on irc.freenode.net some time ago). I'm guessing this would be > a bug in the kernel. Has anyone seen issues or crashes with locally > mounted NFS (either gNFS or kNFS)? > > Jeff White - GNU+Linux Systems Administrator > University of Pittsburgh - CSSD > > On 09/14/2012 03:22 PM, John Mark Walker wrote: > > A note on recent history: > > > > There were past attempts to export GlusterFS client mounts over NFS, but > > those used the GlusterFS NFS service. I believe this is the first > > instance "in the wild" of someone trying this with knfsd. > > > > With the former, while there was increased performance, there would > > invariably be race conditions that would lock up GlusterFS. See the > > ominous warnings posted on this Q&A thread: > > http://community.gluster.org/a/nfs-performance-with-fuse-client-redundanc > > y/ > > > > I am curious to see if using knfsd, as opposed to GlusterFS' NFS service, > > yields a long-term solution for this type of workload. Please do continue > > to keep us updated. > > > > Thanks, > > JM > > -- Harry Mangalam - Research Computing, OIT, Rm 225 MSTB, UC Irvine [m/c 2225] / 92697 Google Voice Multiplexer: (949) 478-4487 415 South Circle View Dr, Irvine, CA, 92697 [shipping] MSTB Lat/Long: (33.642025,-117.844414) (paste into Google Maps) -- What does it say about a society that would rather send its children to kill and die for oil than to get on a bike?
