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iWARP

iWARP is an IETF RDMA protocol suite whose TCP mapping combines RDMAP, Direct Data Placement and MPA framing over TCP.

Related Observatory article: iWARP on hesela.com

Scope: RFC 5040 defines the broader suite to permit TCP, SCTP or other transport mappings; this record explains its TCP mapping. RDMAP supplies RDMA operations above Direct Data Placement (DDP). [1]

Framing: MPA adapts TCP's reliable, ordered byte stream to the record boundaries DDP needs. A TCP connection alone does not implement this RDMA stack. [2]

Storage binding: iWARP is one provider for NVMe/RDMA, not another spelling of NVMe/TCP. Delivery into a remote buffer is not by itself a storage-persistence guarantee. [3] [1]

Relations

related
RDMA storage networking, NVMe/RDMA, RoCEv2, RDMA steering tag

Citations

  1. RFC 5040: RDMAP, sections 1.3 and 2.1 (accessed 2026-10-23)
  2. RFC 5044: Marker PDU Aligned Framing for TCP, abstract and section 3 (accessed 2026-10-23)
  3. NVM Express NVMe over RDMA Transport 1.3, section 2 (accessed 2026-10-23)
Sources & caveats
  • IETF protocol-suite definition and TCP mapping distinguished explicitly; no measured performance or deployment compatibility claim.

JSON: /data/terms/iwarp.json

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Cite this page
Hesela team. iWARP. Hesela. 2026-10-23. https://hesela.dev/terms/iwarp/