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NFSv4.1 client Read/Write operation may hang when pNFS is enabled on the SVM

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • NFS v4.1 or NFS v4.2
  • Parallel NFS (pNFS)

Issue

  • When a NFS v4.1 or NFS v4.2 client attempts to Read/Write to the SVM with pNFS enabled, the operation hangs or latency might be noticed
  • At the same time, the client logs the error  in: /var/log/messages

nfs: [LIF address/hostname] server not responding 

  • After ONTAP upgrade, client connected using NFSv4.1 and started facing read/write hung issues
  • Vserver has multiple data lifs and all are not reachable from clients

 

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