Skip to main content
NetApp Knowledge Base

How does the ONTAP NFS credential cache work?

  1. Last updated
  2. Save as PDF
Views:
205
Visibility:
Public
Votes:
0
Category:
not set
Specialty:
not set
Last Updated:

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.

 

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.