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高い IO 待機時間と、ネットアップ FC LUN に接続されている VM でのレイテンシ

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環境

  • NetApp FAS および AFF ストレージ
  • Fibre Channel ( FC ;ファイバチャネル) LUN

問題

  • Linux VM 上で Oracle DB を実行し、高い I/O レイテンシとレイテンシを観察しました。
  • VM の IO 統計を確認すると、ディスク利用率が高くなることがあります。

Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util

sdc      0.00 0.00 0.00 0.67 0.00 2.67 8.00    6.00     0.00 0.00       0.00 1500.00 100.00

sda      0.00 0.00 0.00 0.33 0.00 1.33 8.00    10.00     0.00 0.00       0.00 3000.00 100.00

dm-0      0.00 0.00 0.00 0.33 0.00 1.33 8.00    12.0      0.00 0.00       0.00 3000.00 100.00

dm-3      0.00 0.00 0.00 0.67 0.00 2.67 8.00    5.00      0.00 0.00       0.00 1500.00 100.0

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