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ロックが原因で高いネットワーク処理(CPU N-blade)レイテンシおよびパフォーマンスの低下

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Category:
ontap-9
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nas
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環境

  • ONTAP 9.6 以降
  • NFSv4

問題

  • Network列で高レイテンシーが確認されますqos statistics volume latency show
  • 高いロックの巻き戻しが確認されます
    • Lock Open OwnerはNFSv4に固有
Cluster::> set diag Cluster::*> statistics start -object rw_ctx -counter nfs_rewinds <wait 1 hour> Cluster::*> statistics show -object rw_ctx -counter nfs_rewinds -value >1 Object: rw_ctx Instance: rw_ctx Start-time: 10/1/2021 21:37:16 End-time: 10/1/2021 22:37:16 Scope: node1 Counter Value -------------------------------- -------------------------------- nfs_rewinds - Lock Open Owner 229597544 <--over 60,000 per second Lock Open State 18610 Cluster::*> 

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