Disaster Recovery
Disaster recovery refers to having business continuity in case of a natural disaster or hacking that terminates an entire Azure region.
There are two ways to implement disaster recovery: Standard Geo-replication and Active Geo-replication.
Standard Geo-Replication
Standard Geo-replication asynchronously replicates committed transactions from an online primary to an offline secondary in a predefined Azure region:
In standard geo-replication:
Only one secondary is allowed in a DR paired region. Each region has a DR pair that can only host the secondary database. The list of DR paired regions is here: http://blogs.msdn.com/b/windowsazurestorage/archive/2013/12/11/introducing-read-access-geo-replicated-storage-ra-grs-for-windows-azure-storage.aspx.
The secondary database is offline and is unreadable. However, it is visible in the master database. The secondary database is readable when failover is done.
The secondary database is priced at...