How to optimize nova and virtual machines for best storage performances

Solution Verified - Updated -


Virtual machines using compute's local ephemeral storage are getting much lower iops/performances compared to the hypervisor.

  • Using fio benchmark running iops-oriented tests (see Diagnostic Steps section for details), we got:

    • around 60k (write) iops at compute level
    • around 10k (write) iops at virtual machine level


  • Red Hat OpenStack Platform 13 (RHOSP) with local ephemeral storage
  • Red Hat OpenStack Platform 16 (RHOSP) with local ephemeral storage

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