On Fri, Apr 26, 2002 at 03:01:16AM +0200, Steffen Persvold wrote: > Hi all, > > A week ago I sent this mail to the NFS list asking for help. I haven't > received any feedback yet so I thought I should ask you guys.. > > Any help highly appreciated.
You didn't give enough info as to what your netfilter rules are. Eg, NFS uses udp. There is a 3min timeout for udp traffic. If your internal machines which talk to the external one don't talk for about 3min then the MASQ entry would get deleted so any other traffic from your external machine to the inside network cannot be mapped any more... Use tcpdump to see what is happening if the internal hosts are quiet for about 3min... Ramin > > On Thu, 18 Apr 2002, Steffen Persvold wrote: > > > Hi all, > > > > I'm experiencing some problems with a cluster setup. The cluster is set up > > in a way that you have a frontend machine configured as a masquerading > > gateway and all the compute nodes behind it on a private network (i.e the > > frontend has two network interfaces). User home directories and also other > > data directories which should be available to the cluster (i.e statically > > mounted in the same location on both frontend and nodes) are located on > > external NFS servers (IRIX and Linux servers). This seems to work fine > > when the cluster is in use, but if the cluster is idle for some time (e.g > > over night), the NFS directories has become unavailable and trying to > > reboot the frontend results in a complete hang when it tries to unmount > > the NFS directories (it hangs in a fuser command). The frontend and all > > the nodes are running RedHat 7.2, but with a stock 2.4.18 kernel (plus > > Trond's seekdir patch, thanks for the help BTW). > > > > Ideas anyone ? > > > > Thanks, > -- > Steffen Persvold | Scalable Linux Systems | Try out the world's best > mailto:[EMAIL PROTECTED] | http://www.scali.com | performing MPI implementation: > Tel: (+47) 2262 8950 | Olaf Helsets vei 6 | - ScaMPI 1.13.8 - > Fax: (+47) 2262 8951 | N0621 Oslo, NORWAY | >320MBytes/s and <4uS latency >
