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1. Download the tgz MOFED package form: http://www.mellanox.com/page/software_overview_ib
2. Untar it on your node 
3. run ./mlnxofedinstall --add-kernel-support --skip-repo
4. if you don't have the needed packages the script will prompt you to install them

   1. yum -y install libxml2-python

   2. yum -y install libnl
   3. yum -y install python-devel redhat-rpm-config rpm-build
   4. yum -y install gcc-gfortran
5. Rebuilt lustre:
   1. sh ./autogen.sh 
   2. ./configure --with-linux=/usr/src/kernels/3.10.0-514.10.2.el7_lustre.x86_64/ --with-o2ib=/usr/src/ofa_kernel/default
   3. make rpms

Alternatively, you can follow instructions provided here: https://docs.mellanox.com/display/ConnectX5ENOCP3/Linux+Driver+Installation