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100GbE 网卡的三个迷思：先破谣，再下单

迷思一：”100GbE 卡只有在 RoCE 网络里才有价值。” 真相：RDMA 只是 E810-CQDA2 的能力之一，不是必要条件。即使你的存储和虚拟化集群完全跑传统 TCP/IP，双口 100GbE 依然把交换机到服务器的瓶颈从网卡移到了交换机——而 E810 同时支持 iWARP 和 RoCEv2 两种 RDMA，意味着同一个网卡可以平滑演进，不必推倒重来。

迷思二：”iWARP 已经过时，只有 RoCE 值得考虑。” 真相：iWARP 跑在标准 TCP 栈上，不需要无损网络（PFC/ECN 配置），在跨厂商、跨机房、不能保证无损的网络上更省心；RoCEv2 在无损、同构网络里有更低延迟。E810-CQDA2 两者都支持，选哪个由你的网络现状决定，而不是由网卡决定。

迷思三：”PCIe Gen4 网卡插 Gen5 服务器是浪费。” 真相：100GbE 只需要 Gen4 x8 的带宽，Gen4 x16 接口为双口满速和 RDMA 头留足了余量；在 Gen5 平台上 Gen4 卡完全兼容，反而让预算花在端口而不是接口代差上。

Core Specifications

기인하다	사양
포트	2 x QSFP28, 25/50/100GbE flexible rates per port
제어 장치	Intel E810-CAM2 (100GbE converged Ethernet)
호스트 인터페이스	PCIe Gen4 x16
RDMA	Iwarp (TCP-based) + RoCEv2
가상화	SR-IOV, VMDq, multiple queues per port, ADQ (애플리케이션 장치 대기열)
오프로드	RSS, LRO, GSO, checksum offload, DPDK/VPP support, UEFI option ROM
Cable types	QSFP28 DAC / AOC / optical modules
폼 팩터	Standard full-height half-length PCIe card, low-profile bracket option
냉각	Passive heatsink, low-power design

Why the E810-CAM2 Silicon Matters

The E810 family is Intel’s converged 100GbE controller generation, and the -CQDA2 is the dual-port QSFP28 adapter built on it. The CAM2 die integrates the MAC/PHY, the RDMA engines for both iWARP and RoCEv2, and the queue management for SR-IOV – so the card does not depend on the host CPU for packet classification or RDMA transport. That is what makes it a drop-in for NVMe-over-Fabric storage nodes, hyper-converged clusters and AI training networks without dedicated switches.

Intel E810-CQDA2 100GbE dual port QSFP28 NIC — 인텔 E810-CQDA2: dual QSFP28 100GbE ports on a PCIe Gen4 x16 adapter.

RDMA: iWARP vs RoCEv2, and When Each Wins

규약	수송	Best environment
Iwarp	표준 TCP/IP	Multi-vendor networks, no PFC/ECN tuning, WAN-spanning RDMA
RoCEv2	UDP with lossless network requirements	Homogeneous low-latency fabrics with PFC/ECN enabled

For most enterprises migrating storage to NVMe-oF, iWARP’s zero-friction deployment on existing switches wins the first phase; RoCEv2 becomes attractive when you control the fabric end-to-end and need the last few microseconds. E810-CQDA2 ships both, so the decision is a network architecture choice, not a hardware purchase.

Virtualization and Queue Depth

With SR-IOV, each 100GbE port presents multiple virtual functions to VMs and containers, each with dedicated queues – critical when a single physical NIC serves dozens of tenants. ADQ (애플리케이션 장치 대기열) lets latency-sensitive applications (데이터 베이스, 캐싱, message queues) pin dedicated queues, cutting tail latency without a dedicated NIC per workload. DPDK/VPP support keeps the card usable for software-defined networking and firewall workloads.

Intel E810-CQDA2 OEM variant — OEM-branded E810-CQDA2 variants (shown: HPE) use the same E810-CAM2 silicon and drivers.

The 10GbE to 100GbE Migration Path

Most fleets migrate in two steps: spine/leaf cores move to 100GbE first, then storage and compute leaves follow. The E810-CQDA2 is the endpoint card for that migration because it auto-negotiates 25/50/100GbE per port – a server can start at 25GbE against existing 25G switches and upgrade optics/cables to 100GbE later without replacing the card. Pair it with QSFP28 DAC cables for short rack-internal links (cost-effective, low power) or AOC/optical modules for longer runs.

Compatibility and Management

Drivers: Intel ice driver family; Windows 서버, 빨간 모자, 우분투, SLES, VM웨어 ESXi, KVM all supported.
Firmware: NVM updates via Intel Ethernet Tool Suite; UEFI option ROM for PXE boot.
원격 측정: per-port counters, link diagnostics and DDP (동적 장치 개인화) profiles for workload tuning.
Platforms: fits any server with a free Gen4/Gen5 x16 slot – see our Poweredge R760 (8 PCIe 슬롯) 또는 엑스퓨전 2288H V7 (17 표준 슬롯).

Intel E810-CQDA2 dual QSFP28 ports close-up — Dual QSFP28 ports: one card, two independent 100GbE links for link aggregation or dual-fabric redundancy.

구매 FAQ

25GbE switch compatibility? 예 – ports negotiate 25/50/100GbE, so existing 25G fabrics work today.
RDMA on my current switches? iWARP works on standard switches with no lossless configuration; RoCEv2 needs PFC/ECN.
NVMe-oF ready? 예 – RDMA + SR-IOV + queue tuning cover NVMe-oF targets and initiators.
DAC or optics? DAC for in-rack links under 3m; AOC for 3-30m; optical modules for longer.
보증? Served with our standard hardware warranty; contact us for volume and custom configs.

Upgrading your storage or compute fabric? We supply the E810-CQDA2 with matching QSFP28 DAC/AOC cables and compatibility-checked server builds – factory-direct pricing, 3-1년 보증, global shipping and free consultation from our authorized partner team. Contact us for a 100GbE migration quote.