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Intermittent severe latency spikes occur between E-Series NVMe controller and ESXi hosts

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Applies to

  • E-Series using NVMe over RoCE (EF300 / EF600)
  • VMware ESXi hosts

Issue

  • Latency measured via VeeamOne shows random spikes
  • No internal latency found on server/storage sides.
  • Firmware/driver updates on ESXi hosts did not help.
  • Nexus switch logs show packet drops, likely due to QoS misconfiguration.
  • NVMe controller stats report frequent KeepAliveTimeout (KAT) events.
    • E-Series support data log -> NVMEOF-STATISTICS.CSV
      "NVMe Controller Statistics (Raw)"

 "NVMe Controllers","TCC","KAT","MQCF","MCCF","CR","CS"

"Controller A, HIC 2, port 2a","4","69","0","0","0","0"
"Controller A, HIC 2, port 2b","4","54","0","0","0","0"
"Controller B, HIC 2, port 2a","4","65","0","0","0","0"
"Controller B, HIC 2, port 2b","4","57","0","0","0","0"


"NVMe controller statistics legend"

"TCC = Total Controller Count"
"KAT = Keep Alive Timeouts"
"MQCF = Max Queue Connection Failures"
"MCCF = Max Controller Connection Failures"
"CR = NVMe Controller Resets"
"CS = NVMe Controller Shutdowns"

  • No physical layer errors; the issue is at the NVMe protocol layer.

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