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FlexGroup constituents don't report the correct IOPS when Qtree QoS Policies are attached

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ontap-9
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Perf
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Applies to

  • ONTAP 9
  • FlexGroup
  • Qtree
  • ActiveIQ Unified Manager (AIQUM)

Issue

  • Qos Policies attached to Qtrees inside the FlexGroup
  • Most IOs land in these Qtrees
  • No Ops or less-than-expected Ops is reported for the FlexGroup constituents, while the whole FlexGroup still reports the correct Ops and Latency
  • This can be confirmed from CLI, AIQ UM, or other performance monitoring tools

Example:

cluster::> qos statistics volume performance show -show-flexgroup-as-constituents true
Workload            ID         IOPS       Throughput    Latency 
---------------     ------ -------- ---------------- ---------- 
-total-              -       618635     32261.01MB/s     2.15ms 
fg1__0001-wid22877 22877        2            0KB/s       200.00us 
fg1__0013-wid12390 12390        1            0KB/s       394.00us 
 

Notes: 

  • show-flexgroup-as-constituents has been specified, this command is supposed to display the performance stats at the FlexGroup constituent level
  • Though the cluster has a Total Ops higher than 600k/s, the top constituent volumes has only 1 or 2 operations per second. The big gap is the concern

 

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