The Longhorn V2 Data Engine is built on the Storage Performance Development Kit (SPDK) and uses NVMe-oF (NVMe over Fabrics) for high-performance, kernel-bypass storage I/O.

Features

• Selective V2 Data Engine Activation
• Configurable CPU Cores
• Hugepage Configuration
• Interrupt Mode
• ublk Frontend Support
• RDMA Transport Support
• Per-Engine QoS Limits
• Per-Node V2 Configuration Labels
• Shallow Copy and Deep Copy

Transport Options

The V2 Data Engine supports two NVMe-oF transport protocols:

• TCP (default) — works on any network, no special hardware required
• RDMA — requires RDMA-capable hardware (e.g., Mellanox ConnectX with RoCE v2), provides lower latency and reduced CPU overhead

See RDMA Transport Support for details on enabling RDMA.

Efficient Rebuilds

Replica rebuilds use SPDK’s shallow copy and range shallow copy primitives, copying only allocated clusters rather than the full volume. See Shallow Copy and Deep Copy for details.