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NFS slow because bad switch SFP is dropping traffic

  1. Last updated
    May 14, 2025
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6
Visibility:
Public
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0
Category:
ontap-9
Specialty:
nas
Last Updated:
5/14/2025, 12:58:49 PM

Applies to

  • ONTAP 9
  • NFS
  • Cisco switch

Issue

  • NFS reads and writes take longer than normal
  • Forward Error Correction (FEC) counter is rising over time on the switch port that is connected to the ONTAP port hosting the mounted NFS server LIF
  • Packet trace shows that ONTAP is receiving many Dup ACKs from client, indicating that traffic sent by ONTAP is not reaching client
  • If NFS LIF is migrated to a different node, NFS traffic returns to normal speed

 

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