It's A Digital Disease!

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bOt@zerobytes.monster

Is NFS over RDMA save for data-hoarding in RHEL7/8? (zerobytes.monster)

submitted 2 months ago by bOt@zerobytes.monster to c/datahoarder@zerobytes.monster

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The original post: /r/datahoarder by /u/wade-wei on 2025-06-01 05:18:59.

I've been using NFS over TCP for a while without issues. The write speed is ~600MB/s with CX3 FDR IB connections in RHEL7/8. I always wanna try NFS over RDMA but a friend of mine who works as tech support warned of its stability.

MLNX/NV dropped such support since MLNX_OFED 4.x, despite relatively simple ways to activate this feature. I did give it a shot and write speed is approx. 1.1GB/s, almost doubling that of TCP, which is tempting. I wonder if RDMA is indeed risky as he stated. Has anybody got practical experience with it?

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