High Load on the Ceph Cluster Being Used for Cinder

Problem

You are observing increased IOPS to the Ceph clusters especially for the Cinder pool.

Environment

  • Platform9 Managed OpenStack - All Versions

Cause

Cinder queries the Ceph cluster periodically to gather data regarding the Cinder backends, volumes and the snapshots present on the Cinder__pool.

Resolution

  1. Add the rbd_exclusive_cinder_pool property to the cinder_override.conf file across all your Cinder hosts. This property needs to be added to the backend configuration stanza.

pf9@test ~ $ cat /opt/pf9/etc/pf9-cindervolume-base/conf.d/cinder_override.conf
[DEFAULT]
enabled_backends = ceph
glance_api_version = 2

[ceph]
volume_backend_name = ceph1
volume_driver = cinder.volume.drivers.rbd.RBDDriver
rbd_exclusive_cinder_pool = true

  1. Restart the pf9-cindervolume-base service for the changes to take effect

pf9@test ~ $ systemctl restart pf9-cindervolume-base

Additional Information

The value for the property is going to be set to True by default starting with the Wallaby release as per the OpenStack release notes.

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High Load on the Ceph Cluster Being Used for CinderProblemEnvironmentCauseResolutionAdditional Information