2 Replies Latest reply on Aug 18, 2016 6:30 AM by pankajd

    How to change speed from FDR to QDR using ibportstate command in centos 6.2

    pankajd

      We have Mellanox Infiniband FDR cards and cables supporting it. We want to reduce the speed of the adapters from 56 Gbps to 40 Gbps. We tried using ibportstate <base lid> <port id> of the node. However, it does not help. Please let me know the exact sequence of commands to do so.

       

      Card :

      Mellanox Tech. MT27500 Family [ConnectX-3]

       

      Switch : Mellanox 6536 Switch

        • Re: How to change speed from FDR to QDR using ibportstate command in centos 6.2
          eddie.notz

          ibportstate <lid > <port> fdr10 0 espeed 30
          ibportstate <lid> <port> reset

            • Re: How to change speed from FDR to QDR using ibportstate command in centos 6.2
              pankajd

              Hi,

               

              Thanks for the help, however, unfortunately this didn't help.

               

              Without firing command:

               

              CA PortInfo:

              # Port info: Lid 144 port 1

              LinkState:.......................Active

              PhysLinkState:...................LinkUp

              Lid:.............................144

              SMLid:...........................442

              LMC:.............................0

              LinkWidthSupported:..............1X or 4X

              LinkWidthEnabled:................1X or 4X

              LinkWidthActive:.................4X

              LinkSpeedSupported:..............2.5 Gbps or 5.0 Gbps or 10.0 Gbps

              LinkSpeedEnabled:................2.5 Gbps or 5.0 Gbps or 10.0 Gbps

              LinkSpeedActive:.................10.0 Gbps

              LinkSpeedExtSupported:...........14.0625 Gbps

              LinkSpeedExtEnabled:.............14.0625 Gbps

              LinkSpeedExtActive:..............14.0625 Gbps

              # Extended Port info: Lid 144 port 1

              StateChangeEnable:...............0x00

              LinkSpeedSupported:..............0x01

              LinkSpeedEnabled:................0x01

              LinkSpeedActive:.................0x00

               

               

              After firing the above mentioned commands, i.e.

              ibportstate 144 1 fdr10 0 espeed 30

              ibportstate 144 1 reset

               

              We get below output

               

              CA PortInfo:

              # Port info: Lid 144 port 1

              LinkState:.......................Active

              PhysLinkState:...................LinkUp

              Lid:.............................144

              SMLid:...........................442

              LMC:.............................0

              LinkWidthSupported:..............1X or 4X

              LinkWidthEnabled:................1X or 4X

              LinkWidthActive:.................4X

              LinkSpeedSupported:..............2.5 Gbps or 5.0 Gbps or 10.0 Gbps

              LinkSpeedEnabled:................2.5 Gbps or 5.0 Gbps or 10.0 Gbps

              LinkSpeedActive:.................10.0 Gbps

              LinkSpeedExtSupported:...........14.0625 Gbps

              LinkSpeedExtEnabled:.............14.0625 Gbps

              LinkSpeedExtActive:..............14.0625 Gbps

              # Extended Port info: Lid 144 port 1

              StateChangeEnable:...............0x00

              LinkSpeedSupported:..............0x01

              LinkSpeedEnabled:................0x00

              LinkSpeedActive:.................0x00

               

              Can you please help ?

               

              CA 'mlx4_0'

                      CA type: MT4099

                      Number of ports: 1

                      Firmware version: 2.30.8000

                      Hardware version: 0

                      Node GUID: 0x0002c903001f69e0

                      System image GUID: 0x0002c903001f69e3

                      Port 1:

                              State: Active

                              Physical state: LinkUp

                              Rate: 56

                              Base lid: 144

                              LMC: 0

                              SM lid: 442

                              Capability mask: 0x02514868

                              Port GUID: 0x0002c903001f69e1

                              Link layer: InfiniBand