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QoS 限制导致卷延迟过高

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Category:
ontap-9
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perf
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适用于

  • ONTAP 9
  • ONTAP Select v9.12.1 及更高版本
  • AFF 系列
  • FAS 系统
  • Cloud Volumes ONTAP (CVO)
  • 服务质量 (QoS)

问题描述

  • 一旦达到 QoS 限制,就会观察到升高的 LUN、卷或 Qtree 延迟。
  • 随着工作负载的变化,可能需要调整 QoS 限制以帮助管理客户性能预期。
  • 可以从 Active IQ Unified Manager 中看到以下警报:事件警报,已违反性能服务级别策略定义的工作负载逻辑单元号 (LUN) 延迟阈值。
  • 延迟将在QoS Max列中qos statistics volume latency show看到:

::> qos statistics volume latency show -volume qostest -vserver testsvm
Workload       ID   Latency   Network   Cluster     Data     Disk   QoS Max   QoS Min    NVRAM
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-        -   646.73ms  1377.00us     0ms   262.00us    9.49ms   635.60ms     0ms     0ms
qostest-wid23..  23350   646.73ms  1377.00us     0ms   262.00us    9.49ms   635.60ms     0ms     0ms
-total-        -   634.31ms  1430.00us     0ms   263.00us    6.78ms   625.83ms     0ms     0ms
qostest-wid23..  23350   634.31ms  1430.00us     0ms   263.00us    6.78ms   625.83ms     0ms     0ms
-total-        -   640.86ms  1324.00us     0ms   304.00us    7.62ms   631.61ms     0ms     0ms
qostest-wid23..  23350   640.86ms  1324.00us     0ms   304.00us    7.62ms   631.61ms     0ms     0ms
-total-        -   659.83ms  1357.00us     0ms   303.00us    7.50ms   650.67ms     0ms     0ms
qostest-wid23..  23350   659.83ms  1357.00us     0ms   303.00us    7.50ms   650.67ms     0ms     0ms

  • 打开文件夹或文件时,访问速度会变得非常慢。

 

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