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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?

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clustered-data-ontap-8
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nfs
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Applies to

Clustered Data ONTAP 8 
Data ONTAP 7 and earlier

Answer

Environment:

Running NFSv4

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.

If data is being served on NFSv3, this behavior is not seen since NFS v3 is a stateless protocol. In NFSv4 and later, NFS is similar to CIFS such that it is now a stateful protocol. A short outage is expected anytime you change the interface you are connected to while using stateful protocols.

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