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Subject: [OMPI users] OPENIB unknown transport errors
From: Tim Miller (btamiller_at_[hidden])
Date: 2014-05-09 13:18:02

Hi All,

We're using OpenMPI 1.7.3 with Mellanox ConnectX InfiniBand adapters, and
periodically our jobs abort at start-up with the following error:

Open MPI detected two different OpenFabrics transport types in the same
Infiniband network.
Such mixed network trasport configuration is not supported by Open MPI.

  Local host: w4
  Local adapter: mlx4_0 (vendor 0x2c9, part ID 26428)
  Local transport type: MCA_BTL_OPENIB_TRANSPORT_IB

  Remote host: w34
  Remote Adapter: (vendor 0x2c9, part ID 26428)

I've done a bit of googling and not found very much. We do not see this
issue when we run with MVAPICH2 on the same sets of nodes.

Any advice or thoughts would be very welcome, as I am stumped by what
causes this. The nodes are all running Scientific Linux 6 with Mellanox
drivers installed via the SL-provided RPMs.