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如何在ONTAP 9中降低磁盘利用率

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适用场景

ONTAP 9

问题描述

  • 由于用户工作负载导致同时执行的操作过多、导致出现磁盘IO延迟。
  • 某个特定SVM/聚合中的多个卷报告高延迟。

  • 使用 Active IQ Unified Manager 或qos statistics volume latency show时,延迟显示在磁盘或聚合处理( Active IQ Unified Manager )中,延迟会在目标卷上受到有效影响。

示例:

cluster1::> qos statistics volume latency show -vserver svm1 -volume vol1 Workload ID Latency Network Cluster Data Disk QoS Max QoS Min NVRAM --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- -total- - 4.71ms 185.00us 7.00us 468.00us 4.04ms 0ms 0ms 11.00us vol1 32140 22.22ms 86.00us 125.00us 904.00us 21.11ms 0ms 0ms 1.00us -total- - 4.58ms 253.00us 7.00us 991.00us 3.32ms 0ms 0ms 11.00us vol1 32140 29.69ms 90.00us 162.00us 2.61ms 26.82ms 0ms 0ms 1.00us -total- - 2.55ms 229.00us 8.00us 589.00us 1.71ms 0ms 0ms 13.00us vol1 32140 18.84ms 61.00us 314.00us 136.00us 18.32ms 0ms 0ms 1.00us -total- - 4.33ms 198.00us 9.00us 1221.00us 2.88ms 0ms 0ms 13.00us vol1 32140 177.16ms 113.00us 226.00us 108.03ms 68.79ms 0ms 0ms 2.00us
  • qos命令 qos statistics workload resource disk 将列表 User-Default 显示为排名靠前的磁盘工作负载。

示例:

cluster1::> qos statistics workload resource disk show -node nodeB Workload ID Disk Number of HDD Disks --------------- ------ ----- ------------------- -total- - 98% 44 User-Default - 83% 44 _Efficiency_... - 10% 44 _WAFL - 3% 44 _RAID - 2% 44

 

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