I am going to bet $0.25 that SSH or TCP/IP is configured to allow the master to get to the nodes without a password, but not from one Compute to the other Compute.
Test by sshing to Compute1, then from Compute1 to Compute2. Depending on how you built the cluster, it's also possible there is iptables running on the compute nodes but, my money is on the ssh keys need reconfiguring. Let us know what you find. Cheers! Greg Date: Wed, 19 Sep 2012 16:11:21 +0000 > From: Antti Korhonen <akorho...@theranos.com> > Subject: [Beowulf] Cannot use more than two nodes on cluster > To: "beowulf@beowulf.org" <beowulf@beowulf.org> > Message-ID: > <B9D51F953BEE5C42BC2B503D288542992DD935FE@SRW004PA.theranos.local> > Content-Type: text/plain; charset="us-ascii" > > Hello > > I have a small Beowulf cluster (master and 3 slaves). > I can run jobs on any single nodes. > Running on two nodes sort of works, running jobs on master and 1 slave > works. > (all combos, master+slave1 or master+slave2 or master+slave3) > Running jobs on two slaves hangs. > Running jobs on master + any two slaves hangs. > > Would anybody have any troubleshooting tips? > > >
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