SQL Server system databases are stored local, but the app databases are stored on SAN storage provided by a NetApp. The NetApp is doing an asynchronous mirror to it's counterpart.

As I understand it if you are using mirroring on SQL server and have failover setup you can adjust the connection strings of your applications that use it so they know the name of the other server ...

Direct Point-to-Point Mirroring: Real-time replication from on-premise SQL Server to Microsoft Fabric via Open Mirroring for fast and seamless unified analytics. Azure Marketplace Availability: Striim ...

Both are mirroring a Windows Server 2003 Standard Edition file server with Exchange. While maintaining the servers, the mirror seems to hold up in realtime even during production hours.