NVMe over TCP vs NVMe over RDMA: A Comprehensive Comparison
A detailed comparison of NVMe/TCP and NVMe/RDMA implementations, including performance benchmarks, cost analysis, and deployment considerations.
Introduction
As organizations modernize their storage infrastructure, choosing the right NVMe over Fabrics (NVMe-oF) transport becomes crucial. This comprehensive guide compares NVMe/TCP and NVMe/RDMA, helping you make an informed decision for your environment.
Performance Comparison
When evaluating storage protocols, performance is often the primary consideration. Let's dive deep into how NVMe/TCP and NVMe/RDMA compare across different performance metrics.
Latency Analysis
Protocol Latency Comparison
- NVMe/RDMA: 10-20μs
- NVMe/TCP: 25-40μs
While NVMe/RDMA offers lower latency, the difference is minimal for most real-world applications. The additional 15-20μs latency of NVMe/TCP is negligible compared to application-level latencies, which often range in milliseconds.
Throughput Metrics
Both protocols can achieve near-wire speed throughput on modern networks. Here's how they compare:
Sequential Read
- NVMe/RDMA: Up to 98% wire speed
- NVMe/TCP: Up to 95% wire speed
Random I/O
- NVMe/RDMA: 2.1M IOPS
- NVMe/TCP: 1.8M IOPS