I got my entire micro cluster (four identical nodes total) set up okay and all of the nodes are connected to a Mellanox MSB-7890 externally managed 36-port 4x EDR IB switch.
I also installed the software package group 'Infiniband Support' after the OS was installed to get everything up and running. OpenSM is running, and all of the nodes can ping each other without any issues.
I'm trying to do some perfomance tuning, especially with the MTU because with the datagram mode, the MTU is maxed out at 2044.
Here are the commands that I am trying to execute:
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# cd /etc/sysconfig/network-scripts/ # ./ifdown ib0 # cat /sys/class/net/ib0/mode datagram # echo connected > /sys/class/net/ib0/mode bash: echo: write error: Invalid argument
I tried searching online in regards to changing from datagram mode to connected mode and even tried to do it via the Settings GUI to no avail.
Your help in this matter is greatly appreciated.