O'Reilly logo

Pro Exchange 2013 SP1 PowerShell Administration: For Exchange On-Premises and Office 365 by Michel de Rooij, Jaap Wesselius

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

CHAPTER 5

image

High Availability

When you have a single Exchange server, whether it be a single multi-role server or two separate servers each hosting one server role, you have a single point of failure, or SPOF. When this server fails, it is not available anymore and your users are without their messaging service.

To overcome this problem you have to implement a high availability solution; in short, that means implementing more servers offering the same service. In the case of Exchange 2013, there are three distinct servers affected.

In Exchange 2013, high availability is implemented by means of a database availability group, or DAG. A DAG is a collection ...

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