I got an error message from Open MPI about not using the default GID prefix. What does that mean, and how do I fix it?
Users may see the following error message from Open MPI v1.2: WARNING: There are more than one active ports on host ‘%s’, but the default subnet GID prefix was detected on more than one of these ports. If these ports are connected to different physical OFA networks, this configuration will fail in Open MPI. This version of Open MPI requires that every physically separate OFA subnet that is used between connected MPI processes must have different subnet ID values. This is a complicated issue. What it usually means is that you have a host connected to multiple, physically separate OFA-based networks, at least 2 of which are using the factory-default subnet ID value (FE:80:00:00:00:00:00:00). Open MPI can therefore not tell these networks apart during its reachability computations, and therefore will likely fail. You need to reconfigure your OFA networks to have different subnet ID values, and then Open MPI will function properly. Please note that the same issue can occur when any two phy
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