Application high availability

High availability can be built-in within the software used for applications, or it can be built from the ground up within applications. One example of the high-availability feature provided by software is SQL server always-on availability groups. They help in keeping databases highly available.

Azure services also have a built-in, high-availability mechanism. In Azure SQL, data is replicated synchronously within the region. Active geo-replication allows up to four additional database copies in the same region or different regions. Azure storage has its own mechanism to make data available by replicating it to multiple data centers and regions.