The NeoSapphire 3501 and 3505 support the NFS RDMA. By default, the service is enabled for the NFS Client. The NFS RDMA port is 20049.
For the RedHat Linux environment, you can use the following commands to install the RDMA package and mount NFS via RDMA:
# yum install rdma; chkconfig --level 2345 rdma on
# mount -t nfs -o rdma,port=20049