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在并发性低、延迟低的工作负载上、无法满足QoS吞吐量下限

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ontap-9
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perf<a>2009553194</a>
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适用场景

  • ONTAP 9
  • QoS吞吐量下限(QoS最小值)
  • QoS吞吐量上限(QoS最大值)

问题描述

  • 吞吐量下限(QoS最小值)的非共享QoS策略设置在 一组具有关键工作负载的卷上 
  • 具有吞吐量上限(QoS最大值)的非共享QoS策略设置在 具有非关键工作负载的另一组卷上
  • 将工作负载同时添加到这两组卷时:
    • 在关键卷上、QoS最小值设置为10k/s、但在以下签名的情况下、它们只能达到6k/s (不满足QoS最小值):
      • 极低延迟(使用确认 qos statistics volume performance show)
        示例:
        cluster::> qos statistics volume performance show -volume vol1 -vserver svm1
        Workload       ID    IOPS     Throughput   Latency
        --------------- ------ -------- ---------------- ----------
        vol1-1354     1354     0       0KB/s     0ms

         
      • 并发性极低(使用确认 qos statistics volume characteristics show)
        示例:
        cluster::> qos statistics volume characteristics show -volume vol1 -vserver svm1
        Workload       ID    IOPS     Throughput Request Size Read Concurrency
        --------------- ------ -------- ---------------- ------------ ---- -----------
        vol1-1354     1354     0       0KB/s       0B   0%       0

         
    • 在非关键工作负载上、QoS最大值设置为4K/s、所有工作负载均可达到4K/s且延迟较低
      • 在工作负载延迟发生中断时、QoS最小值不会出现延迟

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