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ONTAP 9.3 以降、ネットワークレイヤでの ONTAP 単一 LUN のレイテンシ

環境

ONTAP 9.3 から 9.9.0

問題

  • レイテンシが発生するのは、 qos statistics volume latency show のネットワークレイヤに ONTAP のレイテンシがあることが原因です。
  • 読み取りスループットが高い(おそらく 1 GB/ 秒に近い)

例:

Cluster1::> qos statistics volume latency show -volume vol1lun1 -vserver svm1 Workload ID Latency Network Cluster Data Disk QoS NVRAM --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- -total- - 5.52ms 4.41ms 15.00us 981.00us 113.00us 0ms 0ms vol1lun1 10210 14.60ms 14.49ms 6.00us 91.00us 12.00us 0ms 0ms -total- - 4.08ms 3.68ms 13.00us 310.00us 71.00us 0ms 0ms vol1lun1 10210 15.56ms 15.47ms 39.00us 54.00us 1.00us 0ms 0ms -total- - 4.34ms 3.76ms 14.00us 483.00us 85.00us 0ms 0ms vol1lun1 10210 78.37ms 77.86ms 10.00us 430.00us 69.00us 0ms 0ms -total- - 5.08ms 4.44ms 15.00us 514.00us 109.00us 0ms 0ms vol1lun1 10210 86.62ms 85.86ms 5.00us 580.00us 174.00us 0ms 0ms Cluster1::> qos statistics volume performance show -volume vol1lun1 -vserver svm1 Workload ID IOPS Throughput Latency --------------- ------ -------- ---------------- ---------- -total- - 240958 2408.45MB/s 366.00us vol1lun1 10210 52416 1055.11MB/s 105.00ms -total- - 248647 2378.91MB/s 401.00us vol1lun1 10210 52516 1106.35MB/s 120.00ms -total- - 252124 2070.41MB/s 384.00us vol1lun1 10210 49125 995.11MB/s 108.00ms

 

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