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Availability Planning for Mailbox Servers
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In addition to normal IT best practices and redundant hardware, the DAG is the primary high-availability option for Exchange 2010 Mailbox servers. A DAG is a collection of servers that provides continuous replication and availability for mailbox databases, as shown in Figure 11-1.
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Database Availability Group Server1 Server2 Server3
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FIGURE 11-1 A Database Availability Group
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Continuous replication creates a passive database copy on another Mailbox server in the DAG, and then uses asynchronous log shipping to maintain the copies. The continuous replication process follows these steps:
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The active transaction log is written and then closed. The Microsoft Exchange Replication service replicates the closed log to servers hosting the passive database copies.
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ChapTEr 11
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Because each copy of the database is identical, the Log Inspector will examine the transaction logs for the following: Verifies the physical integrity of the transaction log Verifies that the header generation is not higher than the highest generation for the current database copy Verifies the log header matches the generation of the file name Verifies the log file signature in the header matches the log file The transaction log is then placed in the defined transaction log directory.
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The Information Store then validates the transaction log and then applies the logs to the database copy. The databases remain in sync. Requires the Windows failover clustering feature and uses an Enterprise version of Windows server (Windows Server 2008 or Windows Server 2008 R2), although the installation and configuration tasks occur with the Exchange Server management tools. Exchange Server does not use Windows failover clustering to handle database failover. Instead, it uses Active Manager to manage the failover process. Members must have the same operating system. You can add up to 16 servers to a single DAG and create up to 16 copies of a database. Up to 100 databases can be mounted as either a passive or active copy of the database on each server in the DAG. Uses an evolution of the continuous replication technology that is available in Exchange 2007. A DAG can be created after you install the Mailbox server. If a Mailbox server is hosting active mailbox databases, it can be added to a DAG later, it if meets the requirements. Allows you to move a single database between servers in the DAG without affecting other databases. Failover occurs per mailbox database, not for an entire server. Allows up to 16 copies of a single database on separate servers. A server can only host one copy of each database. Requires the database and transaction log copies for each database to be stored in the same path on all servers. For example, if you store Mailbox Database 1 in D:\DB\ Mailbox Database 1\ on Dallas-MB01A, you must also store it in D:\DB\Mailbox Database 1\ on all other servers that host copies of Mailbox Database 1. Defines the boundary for replication, failovers, and switchovers only servers in the DAG can host database copies. You cannot replicate database copies to Mailbox servers that are not in the same DAG. Does not require that all databases have the same number of copies. In a 16-node DAG, one database can have 16 copies, whereas other databases are neither redundant nor have varying number of copies.
A DAG also has the following characteristics:
Availability Planning for Mailbox Servers
ChapTEr 11
In Exchange 2010 transaction log shipping occurs over TCP sockets as opposed to the file share (Server Message Block) used in Exchange 2007. You can view the current TCP port used for replication by running Get-DatabaseAvailabilityGroup -Status | Format-List. The default TCP port used for replication is 64327. This can be set using the Set-DatabaseAvailabilityGroup -ReplicationPort cmdlet. For this change to take effect, you need to create the Windows Firewall exceptions for the new TCP port and then restart the Microsoft Exchange Replication service on each node in the DAG. In the initial release of Exchange 2010, when you created a DAG using the EMC, the DAG was automatically configured to obtain an IP address from DHCP. To complete the configuration and assign a static IP address, you had to use the EMS. In SP1, the DAG can be configured with an IP address from within the EMC. The target member notifies the member running the active copy of which transaction logs it expects to receive. The source member then responds by sending the required transaction log files. After the transaction logs are received from the source server, the files are placed in the target server s Inspector directory for processing. The logs are then inspected and verified for integrity and the header is inspected. After passing inspection, a transaction log is placed in the log directory on the target Mailbox server. If the transaction log does not pass inspection the target server will request it from the source up to three times before setting the mailbox database copy to Failed. When a database copy status is Failed, it will periodically attempt to copy the missing log files in order to return the database to a state of Healthy. The target Exchange server then plays the logs against the local copy of the database. Before this transaction log shipping process can start, the database copy must first be seeded. Seeding is the process of creating a consistent database copy on a DAG member to act as a baseline that will be updated through continuous replication of the transaction log files. This can be accomplished using the following methods:
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