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NFS clients take about 1 minute to recover writing during takeover when using NFSv4

  1. Last updated
    Apr 3, 2025
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Category:
ontap-9
Specialty:
nas
Last Updated:
4/3/2025, 3:21:01 PM

Applies to

  • ONTAP 9
  • NFSv4

Issue

  • NFS clients take about 1 minute to resume I/O during takeover when using NFSv4
  • Aggregate relocation due to Takeover/Giveback starts the lock reclaim grace period as indicated in EMS / event log show :

Example:

[?] Wed Jul 06 09:32:36 +0800 [node2: cf_takeover: cf.fm.takeoverComplete:notice]: Failover monitor: takeover completed
[?] Wed Jul 06 09:32:36 +0800 [node2: cf_takeover: cf.fm.takeoverDuration:info]: Failover monitor: takeover duration time is 3 seconds.

[?] Wed Jul 06 09:32:03 +0800 [node2: lmgr_ng_aggr_grace_worker: lmgr.reclaim.start.grace:debug]: Lock reclaim grace period started on aggregate 'node1_Aggr_Data01' with file system id '651312343'.

[?] Wed Jul 06 09:32:48 +0800 [node2: wafl_exempt01: lmgr.reclaim.stop.grace:debug]: Lock reclaim grace period stopped on aggregate 'node1_Aggr_Data01' with file system id '651312343'.

Note: This affects all NFS versions

  • LIF migration starts separate grace period to allow NFSv4 clients to reclaim locks (default 45s)

Example:

nblade2: Nblade.graceBegin:debug]: NFS server grace state has begun for Vserver "SVM1", LIF ID "1028", LIP IP address "10.1.1.1"

nblade2: Nblade.graceEnd:debug]: NFS server grace state has ended for Vserver "SVM1", LIF ID "1028", LIF IP address "10.1.11.1".

 

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