Availability Groups And Failover Cluster Instances

Derik Hammer digs into a more complex architecture for HA+DR:

The Availability Group will handle the data synchronization between the data centers. Asynchronous mode is recommend due to potential network latency hindering primary site performance. With the combination of these two features, you meet HA with the FCI’s automatic failover locally and DR with manual failover of the Availability Group between sites.

Derik’s conclusion is important:  this isn’t the type of thing a brand new accidental DBA should try to build; there are a lot of moving parts here.  But if you want a robust solution and have the support people available to handle the relative complexity, this is a good option.

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Synonyms And Availability Groups

Allen McGuire shows how to maintain synonyms between instances in an Availability Group: I’m a big fan of using synonyms to point to objects in other databases, but if you’ve tried to use them in conjunction with Availability Groups you may have encountered a slight issue: upon failover, the synonyms are no longer valid because […]

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Synchronizing Availability Group Objects

Derik Hammer has a process to maintain logins, backup devices, linked servers, SQL Agent details, and more between Availability Group nodes: A notable limitation of this process is that it does not update existing objects. Jobs which already exist but were updated, will not be altered. I chose to omit that functionality because it presents […]

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