While iWARP (Internet Wide Area RDMA Protocol) is indeed a valid RDMA networking technology that operates over standard Ethernet networks, it's less commonly used compared to RoCE (RDMA over Converged Ethernet) in data center environments. However, the scenario explicitly states the requirement to eliminate the need for Data Center Bridging (DCB). iWARP typically requires the use of TCP/IP offload engine (TOE) support in network adapters, and while iWARP itself does not require DCB, TOE support might still necessitate the use of DCB for lossless transmission. RoCEv2, on the other hand, is specifically designed to work over standard Ethernet networks without the need for DCB. It aligns more closely with the scenario's requirements. So, while iWARP could potentially be considered, RoCEv2 is generally the more suitable choice in this scenario because it directly addresses the requirement to eliminate the need for DCB.

correct. https://learn.microsoft.com/en-us/azure-stack/hci/manage/validate-qos DCB is required for RDMA over Converged Ethernet (RoCE) networks, and is optional (but recommended) for Internet Wide Area RDMA Protocol (iWARP) networks.