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Why does NFS IO stop during takeover and giveback or during aggregate relocation

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ontap-9
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Applies to

  • ONTAP 9
  • NFSv4.x
  • NFSv3

Answer

  • I/O stops when a storage system serving data over NFSv4 to clients is in a takeover/giveback mode or when an operation such as an aggregate relocation is performed
  • NFSv4.x is a stateful protocol similar to SMB/CIFS
  • A short outage is expected anytime you change the interface you are connected to while using stateful protocols
  • Applications are expected to recover during grace period
  • When NFSv3 is being used, if an aggregate is relocated to another node, NLM lock reclamation occurs for the duration specified by  locking.grace_lease_seconds node level option, therefore, the NFSv3 access will be affected as well.

Additional Information

 

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