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Context and Problem Statement
The long-term storage design assumes ODF Advanced External, but the 1H2026 engagement timeline might favor a simpler interim deployment. We need to choose the structure that meets delivery timelines without blocking migration to the long-term model.
Decision Drivers
- Alignment with the accepted storage backend in ADR-001.
- Time-to-deliver for the 1H2026 engagement.
- Ability to migrate to the long-term external ODF design.
Considered Options
- ODF hyperconverged deployment.
- ODF Advanced External (dedicated Ceph platform).
Decision Outcome
Chosen option: ODF Advanced External (dedicated Ceph platform).
Implementation baseline:
- Production storage integration uses ODF external mode backed by dedicated Ceph clusters.
- Hyperconverged ODF is not a production target and is allowed only for lab/prototyping scenarios.
- Migration and interoperability checks between ODF and external Ceph are mandatory release gates for storage changes.
Pros and Cons of the Options
Option 1 – ODF hyperconverged
Pros
- Faster initial deployment with fewer external dependencies.
Cons
- Per-cluster storage duplication and harder migration to externalized storage.
Option 2 – ODF Advanced External (chosen)
Pros
- Aligns with the dedicated Ceph platform strategy and shared storage model.
Cons
- Requires dedicated storage cluster readiness and integration work.