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ONTAP 9.7 へのアップグレード後に QoS が最小化されるため、レイテンシが増加します

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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可能性があります。
[<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します
  • QoS Min ワークロードが低い遅延センターには高いレイテンシが表示されます

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アラームは、影響を受けたボリュームへのアクセスを数秒間失われたことを報告します
    • Lost access to volume xyz due to connectivity issues. Recovery attempt is in progress and outcome will be reported shortly.

 

 

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