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ボリュームがオフラインのためにCPU N-bladeによるレイテンシが極端に高い

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Category:
ontap-9
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perf
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環境

ONTAP 9

問題

  • CPU N-bladeからの極めて高いレイテンシ
  • EMSにオフライン ボリュームが表示されます

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

  • NFSのリワインドとギブアップの統計チェックでは、数百万件のVLDBルックアップが示されています
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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