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APD error messages observed on VMware due to network congestion

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Category:
ontap-9
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nas
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Applies to

  • Ontap 9
  • NFS
  • Cisco network switch

Issue

  • NFS APD issues observed on VMware ESXi.
  • In vmkernel log we see error messages as below. 

Lost connection to server 1xx.2x.xc.xx mount point
Restored connection to server 1xx.2x.xc.xx

  • Every one hour datastores are disconnecting.
  • When disconnect happens, VM goes into hung state.
  • MTU on ESXi hosts is set to 1500.
  • The NFS.MaxQueueDepth parameter was adjusted to 128, but even after rebooting the hosts, the issue persisted.
  • APD messages are received when VM is running and storage vmotion is happening.
  • Captured simultaneous packet traces and observed network congestion in the path between the two endpoints on certain ports or trunk links
  • Performance archives are analyzed to see if there is any latency, but no latency was observed on affected volumes.

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