O'Reilly logo

Managing the Store & DAG: EXCERPT from Microsoft® Exchange Server 2013 Inside Out by Tony Redmond

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Datacenter Activation Coordination

Some DAGs are deployed across data centers in multiple sites. These environments create a specific problem when catastrophic hardware failures occur that knock out a complete data center. Normally, when multiple servers in a DAG are affected, the DAG remains online if quorum can be maintained or stays offline until the majority of the servers are restored to good health and come online again to establish quorum. At this point, Active Manager attempts to restart DAG operations and activate databases to recover from the failure.

Things are a little more complex when a DAG stretches across multiple data centers, especially if the network connections between the two data centers are lost. As the DAG members gradually ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required