RDMA stands for Remote Direct Memory Access. Technology allowing one computer to access another computer's memory directly with minimal CPU involvement. The term is most useful when a project connects that definition to a concrete use case such as AI training, HPC, storage networks.
For RDMA, interoperability and acceptance start with the governing specification. The design context may include Ethernet, RoCEv2, InfiniBand, congestion control, and the scale-up or scale-out topology used by the compute system. Project documentation should identify the edition, host assumptions, and any vendor-specific limits that apply.
RDMA should not be treated as another name for DCI. RDMA is defined here as Technology allowing one computer to access another computer's memory directly with minimal CPU involvement. By comparison, DCI means Network links that connect separate data centers for traffic exchange, replication, backup, and workload mobility. The two concepts may appear in the same design, but they answer different engineering or purchasing questions.
When selecting or documenting RDMA, verify topology, oversubscription, traffic pattern, congestion control, latency target, failure domain, and scale. A common mistake is to assume that support for Leaf-Spine Network automatically confirms support for RDMA; the exact data sheet, host configuration, and test conditions must show that relationship.
Frequently Asked Questions
How is RDMA different from DCI?
RDMA refers to Technology allowing one computer to access another computer's memory directly with minimal CPU involvement. DCI instead refers to Network links that connect separate data centers for traffic exchange, replication, backup, and workload mobility. They can be related in one project, but one does not prove compliance with the other.
Where is RDMA normally used?
Typical use includes AI training, HPC, storage networks. The exact implementation still depends on the host equipment, link design, environment, and governing specification.
What should a RDMA specification include?
It should state topology, oversubscription, traffic pattern, congestion control, latency target, failure domain, and scale. These details allow a supplier or engineer to verify the requirement instead of relying only on the term RDMA.
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