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Extremely high latency from CPU N-blade caused by volume offline

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Issue

  • Extremely high latency from CPU N-blade
  • Volume offline is displayed in the EMS

[?]  Thu Aug 10 14:22:17 +0900 [node02: vv_config_worker11: wafl.vvol.offline:debug]: Volume 'xxxxxxxx' has been set temporarily offline

  • Statistics check for NFS rewinds and give-ups shows millions VLDB lookup
Cluster::*> set -privilege diagnostics; statistics start -object rw_ctx -counter nfs_rewinds|nfs_giveups
Cluster::*> statistics show -node node-name
Object: rw_ctx
Instance: rw_ctx
Start-time: 4/22/2026 16:16:01
End-time: 4/22/2026 16:16:20 
Elapsed-time: 19s
Scope: node-name
Counter                                                     Value
   -------------------------------- --------------------------------
   nfs_giveups                                                     -
                        Credentials                                0
                             Export                                0
                        VLDB Lookup                                15Mil.  <----

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