We are looking to build a DR infrastructure. Our existing DC setup consists of multiple node Controller, Compute and Ceph nodes as the storage backend. We are using ubuntu 18.04 and Rocky version. 

Can someone please share any document or guide us on how we can build a DR infra for the existing DC?

1. Do we need to have the storage shared across (Ceph)?

2. What are the dependencies?

3. Is there a guide for the same

Thanks

Prem