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  • I'm wondering why, for OP, NFSv3 seems to work. Is it because Linux's RDMA implementation is NFSv4-only and the v3 mount attempt just ignores the option outright? (I probably should reenable NFSv3 here and test.) Commented May 24 at 14:55
  • Just checked. I already have rdma=y and rdma-port=20049. Have confirmed all network hardware supports it both by checking models, the RDMA flags, and the fact it works with v3. Same error persists unfortunately. Commented May 30 at 17:44