This protects the DAG from database-level split brain conditions during switchback to the primary datacenter after a datacenter switchover has been performed, and it enables the use of the built-in DAG recovery cmdlets. For more information, see Datacenter Activation Coordination mode. Add mailbox database copies across Mailbox servers in the DAG.
For detailed steps, see Add a mailbox database copy. This example details how an organization, Contoso, Ltd. Each location contains the infrastructure elements that are necessary to operate a messaging infrastructure based on Exchange Server, namely:.
As illustrated in the previous figure, the solution involves the use of multiple subnets and multiple networks. Each Mailbox server in the DAG has two network adapters on separate subnets. The adapter used for the Replication network in each member provides connectivity only to the Replication network adapters in the other members of the DAG.
As shown in the preceding table, adapters used for Replication networks don't use default gateways. To provide network connectivity between each of the Replication network adapters, Contoso uses persistent static routes, which they configure by using the Netsh.
The administrator has decided to create a Windows PowerShell command-line interface script that performs several tasks:. It uses the Set-DatabaseAvailabilityGroup cmdlet to preconfigure an alternate witness server and alternate witness directory in case a datacenter switchover is ever necessary. Using the same path isn't required; Contoso has chosen to do this to standardize their configuration. The preceding commands add each of the Mailbox servers, one at a time, to the DAG.
The commands also install the Windows Failover Clustering component on each Mailbox server if it isn't already installed , create a failover cluster, and join each Mailbox server to the newly created cluster. To meet their criteria for failure resistance, Contoso is planning to configure each mailbox database with three non-lagged database copies, and one lagged database copy.
The lagged copy will have a configured log replay delay of three days. This configuration provides a total of four copies for each database one active, two non-lagged passives, and a lagged passive. Contoso plans on having four active databases per server.
Therefore the Contoso solution contains 16 total database copies. As shown in the following figure, Contoso is taking a balanced approach to their database layout. Each Mailbox server hosts an active mailbox database copy, two non-lagged passive database copies, and one lagged passive database copy.
The lagged copy of each active mailbox database is hosted on a Mailbox server in the other site. In the preceding examples for the Add-MailboxDatabaseCopy cmdlet, the ActivationPreference parameter wasn't specified.
The task automatically increments the activation preference number with each copy that's added. The original database always has a preference number of 1. The first copy added with the Add-MailboxDatabaseCopy cmdlet is automatically assigned a preference number of 2. Assuming no copies are removed, the next copy added is automatically assigned a preference number of 3, and so forth. Thus, in the preceding examples, the passive copy in the same datacenter as the active copy has an activation preference number of 2; the non-lagged passive copy in the remote datacenter has an activation preference number of 3, and the lagged passive copy in the remote datacenter has an activation preference number of 4.
Although there are two copies of each active database across the WAN in the other location, seeding over the WAN was only performed once. We also include links to the appropriate documentation that provides detailed information about each stage in the process.
For more information about specific versions of Exchange , see the Microsoft Support Lifecycle Search page, and enter "Exchange Server " in the Product Name field. Before we get into the planning steps for your upgrade to Exchange , let's first talk about why you want to upgrade to Exchange We've made multiple improvements to Exchange , including, but not limited to the following:.
With Exchange , we reduced the number of server roles to two: the Client Access server role and the Mailbox server role. The primary design goal for Exchange was for simplicity of scale, hardware utilization, and failure isolation. Data loss prevention DLP is a new feature in Exchange DLP capabilities help you protect your sensitive data and inform users of internal compliance policies.
Smart Search learns from users' communication and collaboration behavior to enhance and prioritize search results in Exchange. Outlook Web App emphasizes a streamlined user interface that also supports the use of touch, enhancing the mobile device experience with Exchange.
The built-in malware filtering capabilities of Exchange helps protect your network from malicious software transferred through email messages. All messages sent or received by your Exchange server are scanned for malware viruses and spyware. With Exchange , users can merge contacts from multiple sources to provide a single view of a person, by linking contact information pulled from multiple locations. Together, these products offer a suite of features that make scenarios such as enterprise eDiscovery and collaboration using site mailboxes possible.
Exchange helps you to find and search data not only in Exchange, but across your organization. With improved search and indexing, you can search across Exchange , Lync , SharePoint , and Windows file servers.
Exchange reduces the number of certificates that an Administrator must manage, minimizes the interaction the Administrator must have with certificates, and allows management of certificates from a central location. Exchange readiness checks make sure that your computer and your organization are ready for Exchange deployment.
Public folders now take advantage of the existing high availability and storage technologies of the mailbox store. The public folder architecture uses specially designed mailboxes to store both the hierarchy and the public folder content. This new design also means that there is no longer a public folder database. Exchange introduces the concept of batch moves, which allows the ability to move multiple mailboxes in large batches.
The new move architecture is built on top of MRS Mailbox Replication service moves with enhanced management capability. Learn how to change the deleted item retention period.
If a user has manually purged an item from the Recoverable Items folder, an administrator can recover the item within the same time period by using the Single Item Recovery feature with remote Windows PowerShell. By default, Single Item Recovery is enabled when a mailbox is created. To learn more, see Enable or disable single item recovery for a mailbox. To preserve messages for longer than 30 days in the Recoverable Items folder, organizations can implement longer-term email preservation or time-based In-Place Holds.
Learn more about placing a mailbox on In-Place Hold. To view feature availability across plans, standalone options, and on-premises solutions, see Exchange Online service description.
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