You might want to ask that on the Beowulf mailing lists - I suspect it has 
something to do with the mount procedure, but honestly have no real idea how to 
resolve it.

On Jan 10, 2012, at 8:45 PM, Shaandar Nyamtulga wrote:

> Hi
> I built Beuwolf cluster using OpenMPI reading the following link.
> http://techtinkering.com/2009/12/02/setting-up-a-beowulf-cluster-using-open-mpi-on-linux/
> I can do ssh to my slave nodes without the slave mpiuser's password before 
> mounting my slaves.
> But when I mount my slaves and do ssh, the slaves ask again their passwords.
> Master and slaves' ssh directory and authorized_keys have permission 700, 600 
> respectively and
>  they owned only by owner mpiuser through chown.RSA has no passphrase.
> 
> Please help me on this matter.
> 
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