Book Image

Microsoft Exchange Server PowerShell Essentials

By : Biswanath Banerjee
Book Image

Microsoft Exchange Server PowerShell Essentials

By: Biswanath Banerjee

Overview of this book

PowerShell has become one of the most important skills in an Exchange administrator's armory. PowerShell has proved its mettle so widely that, if you're not already starting to learn PowerShell, then you're falling behind the industry. It isn't difficult to learn PowerShell at all. In fact, if you've ever run commands from a CMD prompt, then you'll be able to start using PowerShell straightaway. This book will walk you through the essentials of PowerShell in Microsoft Exchange Server and make sure you understand its nitty gritty effectively. You will first walk through the core concepts of PowerShell and their applications. This book discusses ways to automate tasks and activities that are performed by Exchange administrators and that otherwise take a lot of manual effort. Microsoft Exchange PowerShell Essentials will provide all the required details for Active Directory, System, and Exchange administrators to help them understand Windows PowerShell and build the required scripts to manage the Exchange Infrastructure.
Table of Contents (17 chapters)
Microsoft Exchange Server PowerShell Essentials
About the Author
About the Reviewer

Managing Database Availability Groups

Administrators managing and monitoring a highly available deployment of Exchange Servers need to understand some of the key concepts of DAG. In this section, you are going to learn about DAG, Quorum model, and how to add/remove and modify the members of DAG.

A DAG is a collection of up to 16 mailbox servers built at the top of Windows Failover Cluster. We need to understand the concept of quorum before we create our first DAG.

DAG Quorum model

Cluster quorum has been in use for quite some time now in Windows Failover Cluster and the previous releases of Exchange. It is used to ensure that all or majority of the cluster members have a shared and consistent view of the cluster configuration.

When DAG has an even number of nodes, the quorum that is used is the Node and file share majority. It means an external witness server is used as a tie breaker. Let's take an example of four Exchange 2013/2016 Mailbox servers in DAG where every server gets a vote along...