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How does the NFSv4 grace periods work?

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Applies to

  • ONTAP 9
  • NFSv4

Answer

There are two NFSv4 related grace periods:

  1. When a LIF is moved to another node, NFSv4 clients can reclaim locks for the duration specified in the NFS option -v4-grace-seconds

  2. When an aggregate is relocated to another node, NLM lock reclamation takes place for the duration specified by the locking.grace_lease_seconds node level option. 

Note: The NFSv3 access will be affected by this as well.

Note: During either of these periods, NFSv4 clients cannot obtain new locks.

Additional Information

  • After a takeover, the two periods may overlap.
  • On a giveback, interfaces are reverted independently from the time aggregates are relocated and both periods may be observed individually.
  • Depending on the timing of how clients retry NFS calls, client applications may experience longer I/O delays than the grace periods themselves.
  • TR-4067 
  • system node run (netapp.com)

 

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