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Backing Up the Exchange Server 2007 Environment : Leveraging Local Continuous Replication

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6/25/2012 4:43:31 PM

Leveraging Local Continuous Replication

Exchange 2007 has introduced a new concept in backups for the storage groups. This concept is called Local Continuous Replication (LCR). The goal of LCR is to provide a single-server implementation of log shipping to establish a second set of mail databases located on separate disks. The advantage of this is that the local server has an up-to-date copy of the database that can be used in the event of a disk failure on the primary databases.

Note

When utilizing LCR, you might notice that your backup behavior is slightly different than what you are accustomed to. The log files might not truncate as completely as you expect. This is because the LCR mechanism prevents logs from being deleted until they have been committed to the secondary database as well.


To enable LCR on a storage group, complete the following steps:

1.
Click Start, Programs, Exchange, Exchange Management Console.

2.
In the left pane, expand Server Configuration.

3.
Click Mailbox.

4.
In the center pane, click the storage group for which you intend to enable LCR.

5.
From the Action bar, click Enable Local Continuous Replication.

6.
When the Setup Wizard launches, click Next.

7.
Browse to the paths that will host the replica logs and system files. This should be a different disk than the original storage group location. Click Next.

8.
Browse to the path that will host the replica database. This should be a disk other than the one that hosts the primary copy of the database. Click Next.

9.
Review the configuration, as shown in Figure 1. If it is correct, click Enable.

Figure 1. Reviewing the LCR configuration.

10.
When the configuration completes successfully, click Finish.

Tip

When enabling LCR, be sure that the Information Store service is started and the databases are mounted or the seeding of the replica will fail.

After you have enabled your local backup, you can verify the success of the configuration by looking in the directory where you placed the replica database. You will find a file called seeder.txt. Open the file and search for “was seeded successfully” to ensure that your storage group was seeded properly.

Introducing Cluster Continuous Replication

Another new feature available in Exchange 2007 is Cluster Continuous Replication (CCR). The concept with CCR is to be able to maintain a second Exchange server with the same data as the primary Exchange server. This allows an administrator to run an Exchange 2007 cluster without having to utilize shared storage. This means that the secondary node can be located at a different physical location to provide for easy failover if a major site catastrophe should occur. CCR utilizes log shipping to allow the second server to process the same transactions that are performed on the primary copy. 

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