Feature Overview (mandatory - Complete while in New status)

Support cinder replication in order for partner to build DR solution with DR partners.

Goals (mandatory - Complete while in New status)

• Allow partners to productise DR solution with RHOSO
• Today there is no official way to replicate cinder volumes between backends

Cinder replication can be complex especially with the failover / failback aspect and workloads recovery aspect. The goal is to support cinder replication as a building block for partner's solution. The partner's solution will orchestrate / support every failover / failback and workloads recovery aspects. They will use cinder replication as a building block for their solution.

Requirements

Done - Acceptance Criteria

• Upstream Cinder replication CI coverage 
• Downstream Cinder replication CI and coverage
• Partner only documentation 

Use Cases

• DR partner only - enable support for cinder replication to be used by a DR solution provider

Out of Scope 

• non RBD driver originally - Now we need to review the path for Pure and having DR partner own support matrix/cert for storage choices
• We limit ourselves to cinder replication and the associated API. Workload recovery is managed by the partners
• Customer facing documentation

Documentation Considerations

• TBD since the doc should come from the partner in general
• Need to determine what RH may need to supply for DR storage/partners - but not for general docs

Questions to Answer {}{}(Initial completion while in Refinement status):

1. While we test with RBD, Should it only be support for DR solution partner backend storage 
2. Can we have Soltuion partner own certifcation of storage partnerss?
3. Need to work with RH Cert to determine potential DR cert strategy as we can't cinder cert test replication
4.  

Background and Strategic Fit

For RHOSO-18 we will refine this further.  There is a demo request for RH Summit with Trillio who is the lead solution partner

For RHOSO-18 Trillio has a very specific first solution in planning with Pure Storage.  To allow this go to market, the MVP for support is to provide cinder replication as supported for at least that specific use case, ideally with an accompanying RH certification status - not necessarily Cinder CERT.

Customer Considerations 

As a first step we don't want customers to use cinder replication by themselves. It should be embedded in a partner's solution.

EPICs to add and refine next

• DR Solution Partner Requirements
• Partner Facing Documentation
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