Chapter 6. Enabling NFS over RDMA on an NFS server
Chapter 6. Enabling NFS over RDMA on an NFS server Remote Direct Memory Access (RDMA) is a protocol that enables a client system to directly transfer data from the memory of a storage server into its own memory. This enhances storage throughput, decreases latency in data transfer between the server and client, and reduces CPU load on both ends. If both the NFS server and clients are connected over RDMA, clients can use NFSoRDMA to mount an exported directory. Prerequisites The NFS service is running and configured An InfiniBand or RDMA over Converged Ethernet (RoCE) device is installed on the server. IP over InfiniBand (IPoIB) is configured on the server, and the InfiniBand device has an IP address assigned. Procedure Install the rdma-core package: If the package was already installed, verify that the xprtrdma and svcrdma modules in the /etc/rdma/modules/rdma.conf file are uncommented: Optional: By default, NFS over RDMA uses port 20049. If you want to use a different port, set the rdma-port setting in the [nfsd] section of the /etc/nfs.conf file: Open the NFSoRDMA port in firewalld : Adjust the port numbers if you set a different port than 20049. Restart the nfs-server service: Verification On a client with InfiniBand hardware, perform the following steps: Install the following packages: Mount an exported NFS share over RDMA: If you set a port number other than the default (20049), pass port= <port_number> to the command: Verify that the share was mounted with the rdma option: Additional resources Configuring InfiniBand and RDMA networks
dnf install rdma-core NFS over RDMA client support xprtrdma NFS over RDMA server support svcrdma rdma-port= <port> firewall-cmd --permanent --add-port={ 20049 /tcp, 20049 /udp} firewall-cmd --reload systemctl restart nfs-server dnf install nfs-utils rdma-core mount -o rdma server.example.com:/nfs/projects/ /mnt/ mount -o rdma,port=<port_number> server.example.com:/nfs/projects/ /mnt/ mount | grep " /mnt " server.example.com:/nfs/projects/ on /mnt type nfs (..., proto=rdma ,...)