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OpenStack Cinder Volume Detachment Delays with NetApp ONTAP Backends – Eventlet Reactor Blocked by Performance/Dedupe Stats Polling

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Applies to

  • OpenStack Cinder with NetApp ONTAP driver
  • Multi-backend Cinder configurations (multiple SVMs/pools per cinder-volume process)
  • Environments using Platform9 or upstream OpenStack Cinder
  • All Flash FAS (AFF) platforms

Issue

  • Volume detach operations in OpenStack Cinder take 7 minutes or longer, remaining stuck in “Detaching” state.
  • Manual detach/attach operations complete quickly (3–4 seconds) outside of incident windows.
  • Cinder scheduler logs show: 
    No capability reports from this host between [timestamp gap] — this is what stalled detach for ~6 minutes.
Ignoring old capability report from ... at [timestamp] — three seconds before detach timeout.
  • cinder-volume logs contain: 
    report_state ... outlasted interval warnings (e.g., overrun at incident time)
  • All NetApp pools/backends served by a single cinder-volume process (single eventlet reactor).

 

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