Exchange Q&A: Exchange Administration (14)

1.What are the journal rule scope?

  • Internal messages only;
  • External messages only;
  • All messages.

2.What is database availability groups?

A DAG is a group of up to 16 Mailbox servers that hosts a set of databases and provides automatic database-level recovery from failures that affect individual servers or databases.

3.What cmdlet is used for create a DAG?

New-DatabaseAvailabilityGroup

4.What characteristics does DAGs without cluster administrative access points have?

  • There is no IP address assigned to the cluster/DAG, and therefore no IP Address Resource in the cluster core resource group;
  • There is no network name assigned to the cluster, and therefore no Network Name Resource in the cluster core resource group;
  • The name of the cluster/DAG is not registered in DNS, and it is not resolvable on the network;
  • A cluster name object (CNO) is not created in Active Directory;
  • The cluster cannot be managed using the Failover Cluster Management tool. It must be managed using Windows PowerShell, and the PowerShell cmdlets must be run against individual cluster members.

5.How to create a DAG with a cluster administrative access point that will have three servers. Two servers (EX1 and EX2) are on the same subnet (10.0.0.0), and the third server (EX3) is on a different subnet (192.168.0.0) using the Exchange Management Shell?

Run the following commands:

New-DatabaseAvailabilityGroup -Name DAG1 -WitnessServer EX4 -DatabaseAvailabilityGroupIPAddresses 10.0.0.5,192.168.0.5

Add-DatabaseAvailabilityGroupServer -Identity DAG1 -MailboxServer EX1

Add-DatabaseAvailabilityGroupServer -Identity DAG1 -MailboxServer EX2

Add-DatabaseAvailabilityGroupServer -Identity DAG1 -MailboxServer EX3

6.How to create a DAG same as the example above but with out a cluster administrative access point?

Run the following commands:

New-DatabaseAvailabilityGroup -Name DAG1 -WitnessServer EX4 -DatabaseAvailabilityGroupIPAddresses ([System.Net.IPAddress])::None

Add-DatabaseAvailabilityGroupServer -Identity DAG1 -MailboxServer EX1

Add-DatabaseAvailabilityGroupServer -Identity DAG1 -MailboxServer EX2

Add-DatabaseAvailabilityGroupServer -Identity DAG1 -MailboxServer EX3

7.Why quorum is important to ensure consistency, to act as a tie-breaker to avoid partitioning, or to ensure cluster responsiveness?

  • Ensuring consistency;
  • Acting as a tie-breaker;
  • Ensuring responsiveness.

8.What system-wide recommendations should be met before we deploying a DAG and creating mailbox database copies?

  • Domain Name System (DNS) must be running. Ideally, the DNS server should accept dynamic updates. If the DNS server doesn’t accept dynamic updates, we must create a DNS host (A) record for each Exchange server. Otherwise, Exchange won’t function properly;
  • Each Mailbox server in a DAG must be a member server in the same domain;
  • Adding an Exchange Mailbox server that’s also a directory server to a DAG isn’t supported;
  • The name we assign to the DAG must be a valid, available, and unique computer name of 15 characters or less.

9.What are the software requirement to deploying a DAG?

Each member of a DAG must be running the same operating system.

For Exchange Server 2016:

Windows Server 2012, Windows Server 2012 R2 or Windows Server 2016;

For Exchange Server 2019:

Windows Server 2019.

10.What are the software requirement to deploying a DAG?

Each DAG must have a single MAPI network.

Still have questions? Click here to view Microsoft’s official documentation on Exchange.

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