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DBアプリケーションからパフォーマンスの低下とIOタイムアウトが報告される

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Category:
ontap-9
Specialty:
perf
Last Updated:

環境

  • ONTAP
  • NFS
  • Oracle DB

問題

  • Oracleのアラートログは、ディスクI/O処理が原因でLog Writer(LGWR)プロセスに大幅な遅延が発生していることを示しています。
  • アプリケーションから次のエラーが報告されます。
LGWR : Waits for event 'Disk File Operations I/O' for 66 secs
   .... 76 secs
  ---- 126 sec
 LGWR waits on event 'enq: CF - contention' for 90 secs
 
  • ストレージレイヤでパフォーマンスの競合は発生せず、レイテンシはミリ秒未満です。

 

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