FIGURE 11-6 Running RedistributeActivateDatabases.ps1 in Visual C#.NET

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FIGURE 11-6 Running RedistributeActivateDatabases.ps1
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Controlling Database activation
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In large environments you may want to limit which servers can host an active database in the event of a failure so that a database is not brought online in a secondary datacenter if you are performing maintenance on a server or the database is a lagged copy. A database activation policy can be set on the Mailbox server, or only the database copy can be
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ChapTEr 11
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Designing High Availability
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configured to not activate. When setting this on the Mailbox server using Set-MailboxServer ServerName DatabaseCopyAutoActivationPolicy, the following three policies are available:
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Blocked No database can be automatically activated. IntrasiteOnly This prevents database failovers from copies that are not in
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the same Active Directory site.
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Unrestricted This allows any server in the DAG to be for database activation.
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This is the default configuration.
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These policies only affect how Active Manager calculates where to activate database copies. An administrator can manually mount the database on a server that has the activation policy set to Blocked. The server auto activation policy is usually used during periods of maintenance when you do not want a database copy to be automatically activated on a specific server. The second way to control database activation is to suspend database activation on a specific copy of the database. This can be done by running Suspend-MailboxDatabaseCopy <Database Name>\<Server Name> -ActivationOnly, as shown in Figure 11-7. Suspending activation for a specific database copy should be done on copies that you do not want to be activated automatically, such as lagged database copies.
FIGURE 11-7 Suspending activation on a database copy
Unlike setting an activation policy on the Mailbox server, suspending activation on a database copy cannot be mounted directly by an administrator, as shown in Figure 11-8. However, this block can be reset in two ways: when the database copy is reseeded or if replication is suspended and then resumed.
Availability Planning for Mailbox Servers
ChapTEr 11
FIGURE 11-8 Attempting to activate a database copy when activation is blocked
Transport Dumpster
In case failure occurs and some transaction logs are not replicated to the passive copy, the transport dumpster is used to redeliver any recently delivered e-mail. If a database failure occurs, a request is made to the Hub Transport servers to redeliver any lost e-mail messages. The transport dumpster only retains e-mail that has already been delivered. The local submission queue withholds any pending outgoing e-mail. After the transaction logs containing the e-mail message are replicated to and inspected by each DAG member with a copy of the database, the Hub Transport server purges the message from the dumpster. The transport dumpster is enabled by default. Transport dumpster can be configured by using the Get-TransportConfig cmdlet using the following two properties:
MaxDumpsterSizePerDatabase This setting defines the maximum size of the
transport dumpster queue per database and is set globally for the entire Exchange organization. The recommended size is 1.5 times the maximum message size that can be sent. For example, if the maximum size for messages is 20 MB, this parameter should be set to 30 MB.
MaxDumpsterTime This is the time for which the transport dumpster retains
a message if the message is not purged for exceeding the maximum dumpster size. The default is set to seven days.
Managing Database Copies
You can use a number of cmdlets to manage database copies. Understanding the function of each is essential to being able to manage database copies. The following cmdlets are available:
Add-MailboxDatabaseCopy This cmdlet is used to create a passive copy of
an existing mailbox database on another DAG member.
Remove-MailboxDatabaseCopy This cmdlet is used to delete a passive copy
of an existing mailbox database.
Update-MailboxDatabaseCopy This cmdlet updates or seeds a passive
database copy. This is useful in situations in which seeding was not performed when the copy was created, or an error has caused the passive copy to be diverged from the active copy.
ChapTEr 11
Designing High Availability
Suspend-MailboxDatabasaeCopy This cmdlet suspends continuous replication
to the specified database copy.
Resume-MailboxDatabaseCopy This cmdlet resumes continuous replication to
the specified database copy that was previously suspended.
Set-MailboxDatabaseCopy This cmdlet is used to configure the activation
preference, replay lag time, and truncation lag time.
Get-MailboxDatabaseCopy This cmdlet is used to retrieve information about
the mailbox copy, such as the activation preference, replay lag time, and truncation lag time.
Get-MailboxDatabaseCopyStatus This cmdlet is used to retrieve information
about the health of the mailbox database copy.
Obtaining detailed information about the status of the database copies is important. One way to do this is with the Get-MailboxDatabaseCopyStatus cmdlet. Figure 11-9 shows the output of Get-MailboxDatabase | Get-MailboxDatabaseCopyStatus | Format-List. The two properties that are of immediate interest are the Context Index State and the Status, which ideally are Healthy. Also, be sure to note the CopyQueueLength because this is the number of transaction log files that have not been successfully copied to the passive copies. By adding the ConnectionStatus parameter, additional details about the replication networks is shown, such as listing the networks being used for log replication and seeding.
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