China's Domestic FC Switch Achieves 350ns Latency, Outpacing Broadcom's 580ns

Introduction

In April 2025, Chengdu Guanghangxin Technology released the first fully domestic 24-port 16Gbps FC SAN switch. Its defining product philosophy is latency. Third-party authoritative testing certifies its switching latency below 350ns. For context, Broadcom's latest 8th-generation 128Gbps FC switch (Brocade) has a latency of 580ns — a generational speed gap yet nearly 40% lower latency.

Why FC Switches Achieve Sub-350ns Latency

The fundamental reason is not "speed" but that the switch was designed from day one not for "best effort" delivery. Ethernet's philosophy is "delivery is enough"; packet loss is handled by upper-layer retransmission. FC's philosophy is "zero loss". This difference stems from a foundational design choice: Buffer-to-Buffer Credit (BB Credit) flow control.

FC SAN Switch Demand Characteristics

1. Steady-State Low Latency & High-Concurrency I/O Support

Financial settlement, telecom, medical OLTP databases and other I/O-intensive core businesses demand near-stringent low latency and high reliability from storage networks.

2. Stable Bandwidth & Zero Packet Loss (Lossless)

Compared to Ethernet's millisecond-level queuing jitter, FC provides a lossless network with deterministic sub-microsecond latency, making it better suited for settlement transactions, active-active/synchronous replication, and other strong-consistency scenarios.

3. Physical-Layer Security Isolation

FC storage networks are physically isolated from compute networks, effectively cutting off attack paths from compromised compute nodes to high-value storage systems. For example, in a financial macro-virus attack, attackers breached the office network via a malicious Excel file, but strict isolation between storage and compute networks would prevent direct access to financial servers, greatly reducing data leakage and ransomware risk.

4. Business Continuity Under High-Availability Architectures

Supports active-active data centers, two-site-three-center deployments, requiring RPO=0 and RTO≈0 to ensure uninterrupted critical services (financial trading, telecom billing) with zero data loss. This capability is widely used in finance, healthcare, government, and meets mandatory "business continuity assurance" requirements in China's Cybersecurity Multi-Level Protection Scheme 2.0.

Key Technologies of FC SAN Switches

1. Basic Switching Architecture

1.1 BB Credit Buffer Flow Control

The most widely used flow control strategy in the FC technology system. It dynamically maintains credit counters through exchange of FC protocol primitive signals between two FC ports, forming the core of the inter-port credit system and the underlying foundation for end-to-end lossless data forwarding.

1.2 High-Performance Switching Matrix Evolution

FC switches commonly adopt the mature, stable Crossbar architecture, drastically reducing switching fabric control complexity and significantly increasing system throughput. In the same time slot, an N×N Crossbar can support up to N groups of different input/output ports switching simultaneously. The N² crosspoints form a 2D crosspoint matrix, simplifying switch logic to point-to-point direct connections with crosspoint switches controlling on/off states, achieving exponential throughput improvement while greatly reducing control complexity. To further achieve fully non-blocking networks and eliminate head-of-line blocking, the industry has optimized VOQ (Virtual Output Queue) with global shared buffers and CICQ (Combined Input-Crosspoint Queued) based on distributed port buffer strategies, guaranteeing zero packet loss and ordered interaction at the hardware level.

1.3 Multi-Chip Full Mesh Non-Blocking Architecture

High-end FC directors typically use Inter-Chip Links (ICL) to build a full-mesh non-blocking architecture: high-speed ICL links as physical transport channels, full-mesh topology as logical architecture, and non-blocking switching chips as core processing engines, achieving end-to-end non-blocking data transmission across all scenarios.

2. High-Performance Port & Feature System

2.1 High Bandwidth & Low Latency Evolution

FC SAN port rates continue to iterate; mainstream commercial port rates now cover 16G, 32G, 64G, and 128G, with end-to-end latency generally controlled within 1ms. Brocade's latest 128Gbps switch latency is below 580ns; Chengdu Guanghangxin's fully domestic FC switch, certified by a third-party authority, achieves switching latency below 350ns . Leveraging lossless networking and deterministic sub-microsecond latency, it fully meets the performance demands of core databases and AI training.

2.2 Multi-Dimensional Partition Isolation

FC SAN switches support port zoning, FCID zoning, and WWN zoning. WWN zoning is a key underlying capability for cloud transformation of FC storage resources, solving core pain points of security isolation, elastic resource scheduling, and automated management in multi-tenant cloud scenarios, enabling traditional FC storage networks to smoothly integrate into private and hybrid cloud architectures.

3. Multi-Protocol Fusion & Extension

3.1 FC-NVMe

FC networks natively carry NVMe over Fabrics protocol, forming end-to-end NVMe over Fibre Channel storage networks. Compared to traditional SCSI-based FCP mode, this dramatically reduces access latency and optimizes small I/O read/write performance, making it the preferred storage network protocol for all-flash data centers.

3.2 FCoE (Fibre Channel over Ethernet)

A network convergence technology that encapsulates complete FC protocol frames within Ethernet frames for transmission. It fully preserves FC protocol semantics, reliability, and existing management models while reusing standard Ethernet infrastructure to carry storage traffic, ultimately achieving physical convergence of LAN business networks and SAN storage networks.

3.3 FCIP

Encapsulates complete FC frames into IP packets for transmission, building cross-site unified SAN networks. It comes in two forms: traditional external extension appliances and switch-integrated hardware FCIP acceleration. It is a core enabling technology for cross-city data synchronous/asynchronous replication and two-site-three-center disaster recovery architectures.

3.4 FC RDMA

FC RDMA runs RDMA (Remote Direct Memory Access) over FC. Unlike RoCE, FC RDMA leverages FC's native lossless flow control (BB_Credit) without requiring additional lossless network policies like PFC/ECN, achieving zero-copy, kernel-bypass, and CPU offload across devices for sub-microsecond latency and high throughput. Unlike RoCE (dependent on Ethernet lossless config) or InfiniBand (requiring dedicated hardware), FC RDMA can reuse existing enterprise FC SAN infrastructure, offering unique advantages in scenarios demanding extreme data consistency and reliability (e.g., financial core storage backends, AI training data "feeding" links). It serves as a critical bridge connecting high-reliability storage with high-efficiency compute nodes. However, the FC RDMA ecosystem is nascent, bandwidth evolution lags significantly, and whether it can replicate FC's past glory in storage networking under the maturing RoCE v2 trend remains to be seen.

3.5 FC-CXL Collaboration

The two are not directly fused at the protocol layer but build a "high-speed local cache + reliable remote persistence" scale-up tiered storage architecture. CXL uses cache coherency protocols (CXL.cache and CXL.memory) to break barriers between CPUs, GPUs, and local/accelerator memory, drastically reducing local data access latency for AI training and real-time analytics. FC leverages native lossless transmission, deterministic latency, and mature SAN ecosystem to handle cross-node data persistence, active-active disaster recovery, and storage pooling, ensuring system-level data safety and availability. They are decoupled by layer: CXL solves "compute fast", FC solves "store stable", enabling seamless flow between memory-tier and storage-tier data. As CXL 3.x introduces fabric topology and memory pooling, and FC continues evolving toward NVMe-oF, deeper collaborative scheduling under a unified interconnect architecture is expected, building a next-generation data center storage infrastructure foundation with both extreme performance and enterprise-grade resilience.

FC's technical logic has existed for thirty years, but only now has a domestic product emerged that matches international flagships on core metrics.

FC SAN Network Market Size

According to Verified Market Reports, the global FC SAN network market size reached $3.1 billion in 2024 and is projected to climb to $5.06 billion by 2032, with a CAGR of 6.5% during the 2026-2032 forecast period.

Data source: Verified Market Reports report: https://www.verifiedmarketresearch.com/product/fiber-channel-storage-area-network-market/

Major Players & Market Landscape

4.1 FC SAN Switch Market

Main participants are Brocade and Cisco. Brocade holds 75% global market share; Cisco holds 25%. The market is currently dominated and monopolized by US companies. Starting in 2025, domestic forces are rising rapidly: Chengdu Guanghangxin released the first fully domestic 24-port 16Gbps FC SAN switch in April 2025, and the product line has already iterated to a 48-port 32Gbps model.

4.2 FC HBA Card Market

Main participants are Emulex and QLogic, acquired by Broadcom and Marvell respectively, together monopolizing over 90% of the global FC HBA market with full-stack control of "chip + driver + management tools". Domestically, Huawei launched the IN300 series FC HBA cards based on its HiSilicon Hi1822 self-developed chip in 2019, supporting 16Gbps and 32Gbps FC rates, deployed in Huawei's self-developed server modules for high-performance, low-latency storage network access. Overall, the global FC SAN market remains dominated by US vendors; Chinese vendors began achieving core technology breakthroughs and product deployment in 2025, but whether they can form comprehensive competition with international leaders in core technology domains requires longer market validation and application accumulation.

Commercial Model

The FC SAN switch industry generally adopts an "OEM sales primary, own-brand sales secondary" model. For example, the vast majority of Brocade FC switches are sold through top-tier OEMs like Dell EMC and HPE under their brands, while direct own-brand shipments account for a relatively low share. FC HBA cards (including storage array front-end FC interface cards) mainly circulate as hardware components integrated into servers (including storage arrays) to provide FC network communication capabilities.

Summary

The FC SAN switch market has long been monopolized by Brocade and Cisco, with combined high-end market share approaching 90%. Banking core transactions, government classified platforms, and military computing centers — scenarios that tolerate zero failure — previously had to rely on imported equipment. Today, Guanghangxin's strategy is to use steady-state low latency as a lever to demonstrate that domestic equipment not only surpasses international benchmarks on performance metrics but has also completed business deployment and stable operation in sectors such as central SOEs, state-owned enterprises, power & energy, rail transit, healthcare, and education.