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Windows Server

Local Continuous Replications in Exchange Server 2007

2/20/2013 4:56:41 PM

Local Continuous Replication (LCR) is another way in which Exchange Server 2007 provides improved resiliency against failure. LCR works similarly to CCR in that a secondary copy of the databases and log exist on separate storage. In the case of LCR, the secondary copy exists on the same server. This helps protect against media failures because the administrator can quickly switch over to the secondary copy of the logs and databases.

Configuring LCR

Setting up LCR is a fairly simple process and must be performed on each storage group that is to utilize LCR. To enable Local Continuous Replication 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. If it is correct, click Enable.

10.
When the configuration completes successfully, click Finish.

Recovering a Storage Group with LCR

In the event of a failure of either the primary database disks or the primary log disks, you can switch over to the secondary copy via the following process:

1.
Verify that the corruption is not the result of an offline log drive, offline database drive, or a disk volume configuration error. If the log volume of the production storage group is not available (and could be available) at the time of the failover, more data might be lost than necessary.

2.
Assess if the data in the passive copy of the database is acceptable. Typically, the system should be able to recover with all data from the active copy of the database. Thus, the assessment should show that all necessary log files are available. If this is not the case, you should investigate why some or all log files are unavailable.

3.
Disable LCR for the storage group containing the corrupt data.

4.
Dismount the corrupt database. You can use the Dismount-Database cmdlet in the Exchange Management Shell or the Dismount shortcut menu option for the database in the Exchange Management Console.

5.
If you determine the passive copy of the database is acceptable, activate it using either of the following methods:

  • If you are using the NTFS file system volume mount points for your production and LCR storage group and database files, use the Restore-StorageGroupCopy cmdlet to copy all remaining logs and make the database mountable. Remove the existing drive letter assignments for the mount points that contain the storage group and database files. Create new drive letter assignments that point to the mount points that contain the storage group and database files. Continue to step 6.

  • If you are not using NTFS file system volume mount points for your production and LCR storage group and database files, move the corrupted files to a safe location. Use the Restore-StorageGroupCopy cmdlet with the ReplaceLocations parameter to push the copy’s locations into the product locations. This automatically attempts to copy the final logs. Continue to step 6.

6.
Use the Restore-StorageGroupCopy cmdlet as follows:

Restore-StorageGroupCopy -Identity:<Server>\<StorageGroupName> -ReplaceLocations:$true

					  

7.
At the confirmation prompt, type Y, and then press Enter.

8.
The database can now be mounted.

9.
The Restore-StorageGroupCopy cmdlet automatically disables LCR for the storage group. LCR must be reenabled after the recovery is complete.

Limitations of LCR

When using LCR on a storage group, that storage group is limited to a single database. This means that if you planned to use more than 20 databases, you need to either put multiple databases on a single hard drive or you need to mount the hard drives as logical mount points. By using logical mount points, you can get around the limitations on available drive letters.

To take full advantage of the redundancy offered by LCR, you must place the local replica of the logs and databases on drives other than those that host the primary copy. This way, if a drive fails, the replica data is still safe and usable.

If an Exchange Server 2007 Mailbox server is configured as a CCR cluster, it will be unable to utilize LCR for local redundancy.

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