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为什么AIQUM报告的延迟比其他性能监控工具要高?

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适用场景

  • ONTAP 9
  • ActiveIQ Unified Manager (AIQUM)
  • ActiveIQ PAS (AIQ PAS)

问题解答

与其他性能监控工具相比、AIQUM报告延迟的方式有很多不同。如果存在任何未计入的延迟、则AIQ PAS中的服务/延迟中心的延迟会显著增加。  
 
AIQUM: 
  1. 它会使用计算出的总延迟计算不同服务/延迟中心的RAito
  2. 然后、它会使用该比率显示服务/延迟中心对实际总测量延迟的贡献

REST工具(CLI/AIQ PAS/Perfstat)

所有这些工具都将显示实际测量的延迟

 

示例: 

  • 在58毫秒的总延迟中、只有772微秒得到了正确考虑。
  • 集群(集群互连)仅计入487us
  • 但是、AIQUM会报告集群的总延迟为58毫秒、延迟为36.5毫秒。 
    • 集群延迟与总延迟之比为487.00us/772.00us ~= 63%
    • 从集群计算出的延迟为58毫秒x 63%~= 36.5毫秒

> qos statistics volume latency show 

Workload       ID   Latency   Network   Cluster     Data     Disk   QoS Max   QoS Min    NVRAM    
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------     
test_volume111  41567  772.00us  188.00us  487.00us   67.00us     0ms     0ms     0ms   30.00us 

 

> qos statistics volume performance show

Workload       ID    IOPS     Throughput   Latency 
--------------- ------ -------- ---------------- ---------- 
test_volume111  41567     17     86.74KB/s   58.00ms 

注:

  • AIQUD会为每个延迟/服务中心显示一个已烹饪的数字
  • 如果总延迟与所有延迟/服务中心之和之间没有差距、则AIQUM显示的内容与其他工具相同
  • 如果总延迟与所有延迟/服务中心之和之间存在明显延迟、则AIQUM显示的内容可能会发生失真

 

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