- ONTAP 9
- NFSv4 and NFSv4.1
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
- When an aggregate is relocated to another node, NLM lock reclamation takes place for the duration specified by the
During either of these periods, NFSv4 clients cannot obtain new locks.
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.