Nova counts 'local disk usage' for volume-backed instances

Solution Verified - Updated -

Issue

  • When using cinder backend storage for instances, why does nova scheduler/conductor still count this against the local_gb used for each hypervisor?
  • Is it due to the min free of a glance image, or the nova flavor used?
  • What are the recommendations when using cinder backed volumes vs. epehemeral storage?
  • Why do cinder volume backed instances count against the local_gb hypervisor disk?

Environment

  • Red Hat OpenStack Platform 13
  • Red Hat OpenStack Platform 12
  • Red Hat OpenStack Platform 11
  • Red Hat OpenStack Platform 10
  • Red Hat OpenStack Platform 9
  • Red Hat OpenStack Platform 8
  • Red Hat Enterprise Linux OpenStack Platform 7

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