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CONTAP-316617: Improper QoS rate limiting during ONTAP upgrade

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Issue

  • Upgrading from any ONTAP release earlier than 9.14.1 to 9.14.1 or later can trigger unexpected workload throttling and elevated latency.
    • The issue affects all upgrade paths that cross the 9.14.1 boundary.

  • The highest impacted target version is 9.17.1, since direct upgrades are limited to a 4-version hop, making 9.17.1 the furthest reachable target from pre-9.14.1 releases.

  • The node-limit may be incorrectly set to 100 IOPS, resulting in unexpected workload throttling.
    • This can be observed by running the command “qos statistics volume latency show", where the observed QoS Min latency will appear unusually high.

  • This issue occurs regardless of whether QoS floor (min-throughput) policies are configured — it can be triggered with or without QoS floors.
  • This issue might occur on the following platforms
    • AFF
    • ONTAP Select
    • FSx
    • CVS (Cloud Volume Service)
  • This issue would NOT impact the following platforms since QoS Floor V2 is not supported
    • FAS
    • CVO (Cloud Volume ONTAP)

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