How to measure latency for rbd image in RHCS ?

Solution Verified - Updated -

Issue

  • We are experiencing high latency on block devices backed by rbd images for openstack nova instances, Is there any way to determine if issue is from ceph backend side ?
  • How to determine cause for low IOPS on VMs having block devices on ceph pool ?

Environment

  • Red Hat Enterprise Linux 7.x
  • Red Hat Enterprise Linux 8.x
  • Red Hat Ceph Storage 3.x
  • Red Hat Ceph Storage 4.x

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