Dell S3048-ON EMC Solutions for Microsoft Azure Stack HCI Networking Guide - Page 12

Configuration planning

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4 Configuration planning The network adapters installed in the Ready Nodes determine which Remote Direct Memory Access (RDMA) options are available and whether Data Center Bridging (DCB) is required or not. 4.1 RDMA overview S2D Ready Nodes use network adapters that are RDMA capable. RDMA significantly increases throughput and lowers latency by performing direct memory transfers between servers. There are two implementations of RDMA supported with S2D Ready Nodes: 1. RDMA over Converged Ethernet (RoCE). RoCE is defined by the InfiniBand Trade Association (IBTA). S2D Ready Nodes with Mellanox ConnectX-4 Lx adapters use RoCEv2. RoCEv2 uses UDP/IP as its transport protocol. 2. Internet Wide-area RDMA Protocol (iWARP). iWARP is defined by the Internet Engineering Task Force (IETF) and uses TCP/IP as its transport protocol. 4.2 DCB overview DCB provides enhancements to Ethernet communication with Priority Flow Control (PFC) and Enhanced Transmission Selection (ETS). Priority flow control is used to prevent frame loss due to buffer overflows for selected traffic classes such as storage traffic. ETS is used to guarantee a minimum percentage of bandwidth for selected traffic classes. For example, 60% of available bandwidth may be reserved for storage traffic with the remaining 40% reserved for all other traffic. Note: With ETS, 100% of the bandwidth is available for all traffic unless there is contention between traffic classes. DCB is not required for this deployment. However, Dell EMC recommends using DCB if NVMe drives are in use on the Ready Nodes. 4.3 Ready Node network adapter options 4.3.1 QLogic FastLinQ QL41262 The QLogic FastLinQ QL41262 is a dual port 25GbE network adapter that supports both iWARP and RoCE. Note: Dell EMC S2D Ready Nodes with QLogic FastLinQ QL41262 adapters are only validated with iWARP. Ready Nodes with Mellanox ConnectX-4 Lx adapters are validated with RoCEv2. If QLogic QL41262 adapters with iWARP enabled are used, DCB is not required. However, Dell EMC recommends using DCB if NVMe drives are in use. 4.3.2 Mellanox ConnectX-4 Lx The Mellanox ConnectX-4 Lx is a dual port 25GbE network adapter that supports RoCEv2. If Mellanox ConnectX-4 adapters are used, DCB is not required. However, Dell EMC recommends using DCB if NVMe drives are in use. 12 Dell EMC Solutions for Microsoft Azure Stack HCI Networking Guide

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12
Dell EMC Solutions for Microsoft Azure Stack HCI Networking Guide
4
Configuration planning
The network adapters installed in the Ready Nodes determine which Remote Direct Memory Access (RDMA)
options are available and whether Data Center Bridging (DCB) is required or not.
4.1
RDMA overview
S2D Ready Nodes use network adapters that are RDMA capable. RDMA significantly increases throughput
and lowers latency by performing direct memory transfers between servers.
There are two implementations of RDMA supported with S2D Ready Nodes:
1.
RDMA over Converged Ethernet (RoCE). RoCE is defined by the InfiniBand Trade Association
(IBTA). S2D Ready Nodes with Mellanox ConnectX-4 Lx adapters use RoCEv2. RoCEv2 uses
UDP/IP as its transport protocol.
2.
Internet Wide-area RDMA Protocol (iWARP). iWARP is defined by the Internet Engineering Task
Force (IETF) and uses TCP/IP as its transport protocol.
4.2
DCB overview
DCB provides enhancements to Ethernet communication with Priority Flow Control (PFC) and Enhanced
Transmission Selection (ETS). Priority flow control is used to prevent frame loss due to buffer overflows for
selected traffic classes such as storage traffic. ETS is used to guarantee a minimum percentage of bandwidth
for selected traffic classes. For example, 60% of available bandwidth may be reserved for storage traffic with
the remaining 40% reserved for all other traffic.
Note:
With ETS, 100% of the bandwidth is available for all traffic unless there is contention between traffic
classes.
DCB is not required for this deployment. However, Dell EMC recommends using DCB if NVMe drives are in
use on the Ready Nodes.
4.3
Ready Node network adapter options
4.3.1
QLogic FastLinQ QL41262
The QLogic FastLinQ QL41262 is a dual port 25GbE network adapter that supports both iWARP and RoCE.
Note:
Dell EMC S2D Ready Nodes with QLogic FastLinQ QL41262 adapters are only validated with iWARP.
Ready Nodes with Mellanox ConnectX-4 Lx adapters are validated with RoCEv2.
If QLogic QL41262 adapters with iWARP enabled are used, DCB is not required. However, Dell EMC
recommends using DCB if NVMe drives are in use.
4.3.2
Mellanox ConnectX-4 Lx
The Mellanox ConnectX-4 Lx is a dual port 25GbE network adapter that supports RoCEv2.
If Mellanox ConnectX-4 adapters are used, DCB is not required. However, Dell EMC recommends using DCB
if NVMe drives are in use.