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Why do NFSv4 and NFSv4.1 I/O stop while a takeover/giveback, an aggregate relocation occur, or a VFiler Migration?

Last Updated:


Applies to

  • ONTAP 9
  • NFSv4.x


  • 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.
  • If data is being served on NFSv3, this behavior is not seen since NFSv3 is a stateless protocol.
  • Applications are expected to recover during grace period


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