Migrating cloud workloads across Microsoft Azure tenants is essential during business changes like acquisitions or divestitures. The process involves planning to securely separate or join workloads between tenants while maintaining data and service integrity.
Microsoft has published a good pattern for such scenarios: https://learn.microsoft.com/en-us/azure/architecture/solution-ideas/articles/migrate-cloud-workloads-across-security-tenants
When moving data between Azure tenants, creating a sidecar subscription in the same source tenant before moving it is better because of several key reasons:
Temporary Holding Space: The sidecar subscription acts as a temporary holding place for backups, cloned data service resources, or virtual machines. This setup allows reliable data cloning or backup within the original tenant environment before the subscription is moved to the target tenant. This isolation improves safety and manageability during the migration process.
Simplified Subscription Move: Moving the entire sidecar subscription (containing the cloned or backed-up resources) to the new tenant transfers all needed resources at once. This reduces errors compared to moving individual resources cross-tenant, which Azure often does not support directly.
Smooth Migration Path: After moving the subscription, resources can be either moved to the target resource groups or restored to pre-created resources, facilitating a controlled and staged migration or cutover plan
Separation of Concerns and Operational Control: Utilizing a dedicated sidecar subscription helps separate migration workloads from ongoing production workloads, minimizing impact and giving migration teams operational flexibility and control.
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