Hi We are trying to configure RDMA for an infiniband connection between our data server (running CentOS 6.8) and our compute nodes (running CentOS 6.6).? We have been trying to follow the instructions in https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-configuring_the_base_rdma_subsystemedit however we are getting conflicting information on whether the RDMA is correctly configured.??? Some of what we have done and some of the data are below. Can you suggest what other tests and what other data we should get to debug this problem? /etc/rdma/mlx4.conf to set the port types properly for RoCE/IBoE usage. Edit /etc/modprobe.d/mlx4.conf to instruct the driver on which packet priority is configured for the ?no-drop? service on the Ethernet switches the cards are plugged into. vim /etc/rdma/mlx4.conf You can find the right pci device to use for any given card by loading # the mlx4_core module, then going to /sys/bus/pci/drivers/mlx4_core and # seeing what possible PCI devices are listed there.The possible values # for ports are: ib, eth, and auto.However, not all cards support all # types, so if you get messages from the kernel that your selected port # type isn't supported, there's nothing this script can do about it. [root at mseas-data2 mlx4_core]# ls /sys/bus/pci/drivers/mlx4_core 0000:81:00.0bindmodulenew_idremove_idueventunbind mstconfig -d 81:00.0 query Device #1: ---------- Device type:ConnectX3Pro PCI device:81:00.0 Configurations:Current SRIOV_EN1 NUM_OF_VFS8 LINK_TYPE_P13 LINK_TYPE_P23 LOG_BAR_SIZE3 BOOT_PKEY_P10 BOOT_PKEY_P20 BOOT_OPTION_ROM_EN_P11 BOOT_VLAN_EN_P10 BOOT_RETRY_CNT_P10 LEGACY_BOOT_PROTOCOL_P11 BOOT_VLAN_P11 BOOT_OPTION_ROM_EN_P21 BOOT_VLAN_EN_P20 BOOT_RETRY_CNT_P20 LEGACY_BOOT_PROTOCOL_P21 BOOT_VLAN_P21 Needed packages: Most if not all packages appear to be installed on server [root at mseas-data2 ~]# service rdma status Low level hardware support loaded: ??????? mlx4_ib Upper layer protocol modules: ??????? ib_ipoib User space access modules: ??????? rdma_ucm ib_ucm ib_uverbs ib_umad Connection management modules: ??????? rdma_cm ib_cm iw_cm Configured IPoIB interfaces: none Currently active IPoIB interfaces: ib0