What is storage RDMA?

Remote Direct Memory Access is a technology that enables two networked computers to exchange data in main memory without relying on the processor, cache or operating system of either computer. RDMA can benefit both networking and storage applications.

What is RDMA mode?

Remote Direct Memory Access (RDMA) is the remote memory management capability that allows server-to-server data movement directly between application memory without any CPU. involvement.

What is NVMe over RDMA?

NVMe-oF over RDMA RDMA is a way of exchanging information between two computers’ main memory in a network without involving the processor, cache, or OS of either computer.

What is RDMA capable?

In computing, remote direct memory access (RDMA) is a direct memory access from the memory of one computer into that of another without involving either one’s operating system. This permits high-throughput, low-latency networking, which is especially useful in massively parallel computer clusters.

Where is RDMA used?

It is particularly useful when analyzing big data, in supercomputing environments that process applications, and for machine learning that requires low latencies and high transfer rates. RDMA is also used between nodes in compute clusters and with latency-sensitive database workloads.

What is NVMe over Fiber Channel?

NVMe over Fabrics (NVMe-oF) is an extension of the NVMe network protocol to Ethernet and Fibre Channel delivering faster and more efficient connectivity between storage and servers, as well as a reduction in CPU utilization of application host servers.

How do I know if RDMA is enabled?

There are two options to do this: using the service file or using lsmod.

1. Verify that RDMA kernel part is loaded using service file.
2. Verify that RDMA kernel part is loaded using lsmod.
3. Verify that RDMA devices are available.
4. Verify that RDMA devices can be accessed.
5. Send traffic using ibv_*_pingpong.
6. Send traffic using rping.

Is RDMA required for storage spaces direct?

One of Storage Spaces Direct’s advantages is RDMA networking support that lowers latency and reduces CPU consumption. I often get the question “Is RDMA required for Storage Spaces Direct”. The answer to this question is: no. We support plain-old Ethernet as long as it’s 10GbE or better.

What is an RDMA network?

An RDMA network adopts a protocol such as RoCE, iWARP, or InfiniBand to send data between the memory address space through the interface, which speeds up operations to increase the value of application, server, and storage investments.

What is rdrdma on fabric?

RDMA on Fabric is a logical evolution of the existing shared storage architecture, benefiting from solid-state and flash memory, which improves performance access to shared data.

How much better is RDMA for performance?

I think there are two key take-away’s from this data: Use RDMA if you want the absolute best performance. RDMA significantly boosts performance. In this test, it shows 28% more IOPS. This is realized by the reduced IO latency provided by RDMA. It also shows that RDMA is more CPU efficient (27%), leaving CPU to run more VMs.