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Does SMB 3.0 Multichannel feature operate on LIFs across multiple nodes?

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Applies to

  • ONTAP 9
  • SMB3 Multichannel

Answer

  • No. SMB 3.0 Multichannel does not support binding SMB sessions to multiple nodes so it does not operate on LIFs across multiple nodes.
  • SMB 3.0 Multichannel Technical Report TR-4740 explains this behavior as follows.
    • In an ONTAP cluster, a given SVM can have LIFs hosted on multiple nodes. In the current architecture, the CIFS runtime state (connections, sessions, open files, and so on) is a node-scoped, in-memory state that is not shared between multiple nodes. Node1 is not aware of CIFS sessions established on Node2. Multichannel does not change the scope of the CIFS runtime state. Because a given CIFS session is visible to only one node, the SMB3 client can be allowed to bind the session to the connections that are established to the LIFs hosted on only that node. When the SMB3 client queries for a list of interfaces, the node returns only the locally hosted LIFs.

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