[Beowulf] How to debug error with Open MPI 3 / Mellanox / Red Hat?

[Faraz Hussain]

Quoting John Hearns <hearnsj at googlemail.com>:

> What does   ibstatus   give you

[hussaif1 at lustwzb33 ~]$ ibstatus
Infiniband device 'mlx4_0' port 1 status:
         default gid:     fe80:0000:0000:0000:4a0f:cfff:fef5:b650
         base lid:        0x0
         sm lid:          0x0
         state:           4: ACTIVE
         phys state:      5: LinkUp
         rate:            40 Gb/sec (4X QDR)
         link_layer:      Ethernet

Infiniband device 'mlx4_0' port 2 status:
         default gid:     fe80:0000:0000:0000:4a0f:cfff:fef5:b658
         base lid:        0x0
         sm lid:          0x0
         state:           1: DOWN
         phys state:      3: Disabled
         rate:            40 Gb/sec (4X QDR)
         link_layer:      Ethernet

[hussaif1 at lustwzb33 ~]$