LEARN. PRACTICE. GROW.Concept and mechanism
Recovery automation should be observable, repeatable, and interruptible when dangerous conditions arise. Before restoring over a destination, confirm its identity, state, and possibility of containing newer data. Repeating a destructive action until the script turns green is not a recovery strategy. In etcd 3.6, snapshot restoration creates a new logical cluster with new cluster and member identities; members should use the same snapshot. Mixing snapshots from different times is not a supported merge of histories. Preserve separation between restored state and old members that may still exist, following documentation and procedures appropriate to the installation.
Guided application
Returning to the primary site requires protecting changes made during contingency. In the Azure-to-Azure example, reprotect prepares reverse replication before planned failback. Changing DNS transfers no data and does not establish write authority. Confirm synchronization, window, functional acceptance, and protection against the next failure. Also distinguish test failover: test-VM changes are not replicated back and may disappear during cleanup. Preserve evidence and apply approved changes through the normal process. In a fictional handover, the manager presents timings, recovered points, reconciled data, restored protection, and owned actions. Infrastructure return is only one step; service outcome and residual risk need to remain explicit.
After days on the secondary, the old primary can be available while containing stale data.
Common pitfalls
Primary label as authority; DNS as synchronization; test failover as failback; green script as restored protection.
Related topics: Objectives and dependencies · Strategies and data protection · Backups and recoverable points
Return with reconciled data, controlled authority, and future recovery prepared.
Reference: Azure Site Recovery reprotection and failback · DR recovery 2026-09; PostgreSQL 18, etcd 3.6 and selected AWS/Azure behavior