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How does the NFSv4 grace periods work?

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Category:: ontap-9

Specialty:: nas

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Applies to

ONTAP 9
NFSv4 and NFSv4.1

Answer

There are two NFSv4 related grace periods:

When an interface is moved to another node, NFSv4 clients can reclaim locks for the duration specified by the -v4-grace-seconds NFS option.
When an aggregate is relocated to another node, NLM lock reclamation takes place for the duration specified by the locking.grace_lease_seconds node option. The NFSv3 accessing will be affected by this as well.

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 before 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.