Architecting NVMe Storage Arrays with RAID-10 (5169)

Technical Overview

Engineering breakdown of Architecting NVMe Storage Arrays with RAID-10 (5169). Bare-metal hardware performance requires isolated kernel parameters, careful queue depth tuning, and deterministic latency paths. This article walks through the full stack: from PCIe topology and NUMA placement to mdadm RAID‑10 layout, I/O scheduler selection, and real‑world benchmark methodology.

Key Design Pillars

• PCIe Lane Allocation – Ensure each NVMe device receives a full x4 Gen4 link; avoid bifurcation that splits lanes across multiple drives.
• NUMA‑Aware Affinity – Bind interrupt handlers and application threads to the same NUMA node as the controller.
• RAID‑10 Stripe Size – 256 KiB stripe aligns with typical NVMe block size and maximizes sequential throughput while preserving low write amplification.
• I/O Scheduler – Use none (no‑op) or kyber for NVMe; avoid CFQ/Deadline which add latency.