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How does the ONTAP NFS credential cache work?

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Applies to

  • ONTAP 9
  • NFS

Answer

  • When a client accesses the node (nblade), ONTAP will check if the cached entry exists. 
    • If the cache exists, the credential is served from the node cache. 
    • ONTAP will then check if the cache is expired.
      • If expired, ONTAP will then check the global cache otherwise known as the cluster cache.
        • If the global cache exists, ONTAP will check if the user (passwd) exists.
          • If the user exists, ONTAP will check if the user has group membership.
            • If no group membership exists, ONTAP will query (group) for the groups. 
              • Upon successful query, ONTAP will synchronize the global cache.
            • If yes, ONTAP will synchronize the global cache.
          • The user does not exist, ONTAP will query (passwd) for the user. 
            • Once the user is successfully queried, ONTAP will repeat the cycle and check if the user has group membership. 
              • If no group membership exists, ONTAP will query (group) for the groups. 
                • Upon successful query, ONTAP will synchronize the global cache.
              • If yes, ONTAP will synchronize the global cache.
      • If not expired, access continues without further actions for the cache.

Additional Information

  • On cache expiration, unless the entry was harvested, reuse it and set the flag pending refresh.
    • Do not reuse while pending refresh once refresh completes, the cache entry will be updated and the flag removed.
  • After the first for 914483, the expired NFS credential will continue to be used until refresh completes.
  • If the credential does not exist, it will be created in a partial state, and ONTAP will continually attempt refresh until it succeeds.

 

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