OpenStack Cinder with Ceph under the hood
What’s happening under the hood while playing with Cinder and Ceph? Answer table :-).
| ACTION | RESULTS |
|---|---|
| Create a volume | New RBD image gets created in the pool configured in your cinder.conf. |
| Create a volume backup | Create a new volume in the destination pool, the first backup is a full copy, the new ones will be incremental. |
| Create a volume from a snapshot (with rbd_flatten_volume_from_snapshot=false) | Creates a new volume. Will be a clone in Ceph and the parent will be the snapshot. |
| Create a volume from a snapshot (with rbd_flatten_volume_from_snapshot=true) | Creates a new volume. Will be a new RBD image in Ceph. |
| Create a volume from a volume | The source volume gets snapshotted and the volume will be clone of this snapshot. |
| Create volume from image | If the image is in a Ceph pool and its location exposed then the volume will be a clone. |
| Create a snapshot | Creates an RBD snapshot. |
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