The RoCE adapter supports RDMA connectivity over converged networks. RDMA is a technology to send data over a network without involving the CPU in the transfer.
Enabling RDMA over a Converged Ethernet network infrastructure provides faster data transfer for network-intensive applications through lower I-O latencies on this network. IOPS performance is improved in comparison to other network-based storage connectivity options. The port speed for the Mellanox adapter is 25 GbE.
- Verify that the VxRail cluster is configured with a minimum version of VxRail 7.0.200.
- Configure all nodes in the cluster that are connected to the common VMware vSAN data store with RoCE-supported adapter cards from the same vendor with the same model. Variations in adapters from different vendors or different models can disrupt I/O on the VMware vSAN data store.
- The Ethernet ports on the RoCE-supported adapters are reserved for VMware vSAN traffic only.
- The physical network supporting VMware vSAN is configured as a lossless network. To determine which Ethernet adapters support RDMA, see the appropriate VxRail Support Matrix on the Dell Support site.