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Currently, the SPDK data engine only supports offline replica rebuilding for volumes. The objective of this ticket is to develop an automatic offline replica rebuilding feature. If a degraded volume gets detached, this mechanism will attach the volume, deactivate the frontend, and initiate the rebuilding process.

The tasks of the ticket:

• Introduce a global setting offline-replica-rebuilding (boolean)
• introduce volume spec and status fields
  • spec.offlineReplicaRebuilding: per-volume setting
  • status.offlineReplicaRebuildingRequired
• implement the offline rebuilding logics based on
  • current rebuilding logics
  • AD controller

In the future, the feature could also be extended to legacy volumes. The benefit of this feature is to automatically heal degraded volumes, even if they are out of service.

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