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CONTAP-70759: High Latency from QoS Min on workloads with no QoS Policy or not in Adaptive QoS policy

  1. Last updated
    Apr 24, 2025
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21
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:
4/24/2025, 3:53:40 PM

Issue

  • High Latency from QoS reported on workloads with no QoS or no Adaptive QoS policy applied.
  • TCP zero windows are being reported from ONTAP
  • Disconnects may be seen or errors about maintaining connectivity due to the high latency passing timeout thresholds
    • Example: ESXi error seen due to Adaptive QoS and minimum latency:
      • Lost access to volume xyz due to connectivity issues. Recovery attempt is in progress and outcome will be reported shortly.
  • High latency is visible in the QoS Min delay center, with low workloads

Example:
Cluster::> qos statistics volume latency show
Workload ID Latency Network Cluster Data Disk QoS Max QoS Min NVRAM
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
...
vol1-wid123 1456 719.23ms 383.00us 4.00us 525.00us 145.00us 0ms 717.99ms 177.00us
vol2-wid234 16744 716.25ms 386.00us 4.00us 613.00us 117.00us 0ms 714.91ms 215.00us
vol3-wid567 6399 712.09ms 442.00us 0ms 1281.00us 1284.00us 0ms 709.08ms 0ms

 

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