2.5. Placement of LVM-VDO in the storage stack

You must place certain storage layers under a VDO logical volume and others on top of it.

You can place thick-provisioned layers on top of VDO, but you cannot rely on the guarantees of thick provisioning in that case. Since the VDO layer is thin-provisioned, the effects of thin provisioning apply to all layers. If you do not monitor the VDO volume, you might run out of physical space on thick-provisioned volumes on top of VDO.

Since the supported placement of the following layers is under VDO, do not place them on top of VDO:

The following configurations are not supported: