We need to add storage planning section in Director guide for ceilometer & gnocchi components. For example: Controller: Ceilometer will use mongodb database . >> Provide some equation/suggestion of storage usage for a value of ttl. Gnocchi driver=[file|swift|ceph|s3] >> http://gnocchi.xyz/3.0.7/architecture.html#how-to-plan-for-gnocchis-storage