Why should I use iwarp, roce V2, nvme of and other protocols for 100g network transmission

With the explosive growth of data , Move faster 、 The need to store and process more data , Critical to growing your business and staying competitive . To support fast data transfer for high-performance storage ,LR-LINK Launched by Lianrui 100G Dual optical port Ethernet network adapter （ model ：LRES1014PF-2QSFP28）. This network card adopts intel E810 Master plan , Three Ethernet based transport protocols are supported ： be based on iWARP RDMA Of NVMe, be based on RoCE v2 RDMA Of NVMe And based on TCP（ Transmission control protocol ） Of NVME. Besides , You can apply device queues （ADQ） Technology to speed up TCP Upper NVMe. however , How do you determine which transport protocol is more appropriate for your organization ？

First , Remote direct memory access （RDMA） Support iWARP and RoCE v2（ Integrating Ethernet RDMA） Two protocols .RDMA It enables two computers on the same network to exchange memory without involving the operating system or processor , This further reduces latency . In this regard ,LR-LINK Launched by Lianrui PCIe x8 double / The four port 10 Gigabit Ethernet network adapter also meets . Besides , We find that congestion management is important for RDMA Deployment is critical , Because it can minimize packet loss and improve network performance and scalability . therefore ,LR-LINK Launched by Lianrui 100G Dual optical port Ethernet network adapter （ model ：LRES1014PF-2QSFP28） Support congestion based notification （ECN） And round trip time （RTT） Congestion control technology of .

Three network transmission protocols

One 、 Use iWARP Of RDMA

iWARP be located TCP / IP above , It can be done by TCP Transmission reliability to manage traffic congestion . use iWARP Transport protocols may need to be considered iWARP, Because it has a high degree of scalability , And it can work across standard Ethernet , But not DCB（ Data Center Bridging ） and PFC（ Priority flow control ） Complexity , This makes it easy to deploy and maintain . Besides ,iWARP Still using legacy infrastructure （ Such as existing switches and routers ）, At the same time make full use of RDMA High performance and low CPU Usage rate .

Two 、 Use RoCE v2 Of RDMA

RoCE be located UDP / IPv4 or IPv6 above , And run on the converged Ethernet , Converged Ethernet uses a set of DCB Enhancements to create lossless Ethernet , And pass PFC To configure .RoCE v2 yes RoCE Upgraded version , To take advantage of the user datagram protocol （UDP） And can be routed . Even though RoCE v2 Usually with iWARP Poor scalability , But it takes advantage of RDMA High performance and low CPU Usage rate , At the same time, the popular Ethernet standards and more clearly defined controls are used , To achieve a more efficient network .

3、 ... and 、 have ADQ Acceleration function NVMe over TCP

Even though iWARP and RoCE v2 Both have obvious speed advantages , But not all organizations have immediate support RDMA Required infrastructure .NVMe / TCP Enable customers to use TCP In existing IP Transfer data over the network , To run on an existing Ethernet infrastructure NVMe-oF. For businesses that have invested heavily in their legacy infrastructure , This could be a very attractive option .

Each of the above three transport protocols has its own advantages , The final choice of transmission mode depends on the consistency between your organizational structure and the transmission protocol . besides ,R-LINK Launched by Lianrui 100G Dual optical port Ethernet network adapter （ model ：LRES1014PF-2QSFP28）, Support 2x100G/4x50G /8x25G/8x10G/8x1G Port transfer rate , It is the most ideal solution for data center storage applications .

Lianrui official website ：lrnic.cn