Author: Steven Schneider
Reviewers: Sanjay Mishra, Shep Sheppard, Mike Weiner, Kun Cheng, Rama Ramani, Yorihito Tada, Hongyi Wang
If you are looking for multi region continuous availability, by extending your current availability group to a remote Azure datacenter, then this blog is for you. We start with an existing availability group already setup within Azure, walk you through setting up VPN connectivity by taking advantage of the Azure-to-Azure VPN functionality, extend your infrastructure and setup your asynchronous replica. At the end of this blog, your SQL Server AlwaysOn Availability Group in Azure will consist of the following elements:
- 2 virtual networks with VPN connectivity between West US and East US, as an example.
- A domain controller on each site with Active Directory (AD) and Domain Name Services (DNS).
- 2 snchronous replicas in WestUS and an asynchronous replica in EastUS. Synchronous was chosen for the WestUS replicas since they are within the same region and asynchronous for the EastUS replica since it is cross region.
- An extended availability group with an asynchronous commit replica of an availability database.
Below are a couple diagrams showing you what your environment should look like before you start (Figure 1) and what it will look like when you are finished (Figure 2).
Figure 1: Initial State
Figure 2: Final State
Please see the original documentation for the complete steps.