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キャッシュ ヒット率が低いため、読み取りスループットが書き込みスループットを下回る

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ontap-9
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perf
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環境

  • ONTAP 9
  • CIFS / SMB プロトコル
  • HDDディスク(SATAまたはSAS)を搭載したFASシステム

問題

  • 特定のボリュームの読み取りスループットが、ファイル転送時の書き込みスループットよりも大幅に低い
  • 読み取りレイテンシが書き込みレイテンシよりはるかに高い
  • ディスクI/Oは読み取りレイテンシの主な要因

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