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ONTAP 9 .7へのアップグレード後、QoS最小レイテンシが高くなるためレイテンシが増加

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環境

  • ONTAP 9.7またはONTAP 9.8
  • Quality of Service(QoS)
  • アダプティブQuality of Service(AQoS):

問題

  • 次のEMSエラーが表示されることがあります。
[<node_name>: qos_vd_window_manager: qos.VioDet.maxThrottle:notice]: QoS violation limit for NODE <UUID> is 95424 IOPS.
  • ONTAP 9 .7へのアップグレード後にQoSが原因でレイテンシが増加
  • QoS Min 遅延センターには高レイテンシが表示され、ワークロードが少ない

例:

Cluster::> qos statistics volume latency show Workload ID Latency Network Cluster Data Disk QoS Max QoS Min NVRAM --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ... vol1-wid123 1456 719.23ms 383.00us 4.00us 525.00us 145.00us 0ms 717.99ms 177.00us vol2-wid234 16744 716.25ms 386.00us 4.00us 613.00us 117.00us 0ms 714.91ms 215.00us vol3-wid567 6399 712.09ms 442.00us 0ms 1281.00us 1284.00us 0ms 709.08ms 0ms
  • VMwareのアラームレポート「Lost access to the affected volumes for a few seconds」
    • Lost access to volume xyz due to connectivity issues. Recovery attempt is in progress and outcome will be reported shortly.

 

 

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