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With those basic questions and considerations out of the way, let s take a look at implementing SCR
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Setting Up SCR
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Setting up SCR is a relatively simple task The New-StorageGroup and EnableStorageGroupCopy commands used for LCR and CCR are enhanced in Exchange Server 2007 SP1 to handle SCR, with the StandbyMachine, ReplayLagTime, and TruncationLagTime parameters added
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ReplayLagTime
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The default ReplayLagTime, which is the time an SCR target waits before replaying or committing transaction logs to the replica database, is 24 hours It can be set to as high as 7 days, or as low as 0 seconds However, setting it to a very low interval takes away from the capability to provide protection against database corruption of the SCR source It is recommended to set this to a few hours, to ensure enough time has lapsed to allow for the detection of database corruption on the SCR source and avoid having the SCR target in the same state Once this is enabled, you may not see much activity on SCR replicas if the source storage group has less than 50 transaction logs By default, SCR has a copy lag of 50 log files
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TruncationLagTime
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In addition to be able to delay replaying transaction logs to a replica, SCR also allows you to delay truncation of transaction logs after they have been replayed to the target database The maximum truncation lag can be seven days Note that this value cannot be changed after it has been set that is, without disabling and reenabling SCR for a storage group This begs the question: When do files get truncated on the SCR source and replica When using LCR and CCR, it makes sense to truncate log files after they have been replicated and replayed to the passive copy SCR introduces the ability to delay replay and truncation Further, a source storage group can have one or more SCR targets, perhaps with different replay and truncation lags When would it be safe to flush these logs at the source and at the target It is logical to expect that the source should not wait for all SCR targets to replay the logs It can truncate them as soon as they are replicated and inspected (but perhaps not replayed because of the replay lag) by all SCR targets, and a backup of the source completes successfully Additionally, if the source has LCR enabled or is hosted on a CCR cluster, it should wait until the LCR or CCR replica has replayed the logs In most deployments, one can expect the latter to happen rather quickly On the SCR target, log files are truncated if the log file generation sequence (log files in a storage group are numbered sequentially) is below the log file that the storage group s checkpoint file points to, and the file is older than the replay and truncation lag times combined
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NOTE For more details about how Exchange Server 2007 s transaction logging works, as well as
how the checkpoints are maintained and used, refer to Understanding Transaction Logging, in the Exchange Server 2007 documentation This is available online at https://technetmicrosoft com/en-us/library/bb331951(EXCHG80)aspx
19:
H i g h Av a i l a b i l i t y
SCR can be enabled for a new storage group when it is created, using the following command:
New-StorageGroup Server "DFMailman" Name "DFMailman-SG2" LogFolderPath "E:\Logs" SystemFolderPath "F:\Database" StandbyMachine MIRROR
This command creates a new storage group called DFMailman-SG2 on server DFMailman, sets the log folder path and system folder (database) path, and enables SCR replication to the target server named MIRROR If required, the ReplayLagTime and TruncationLagTime parameters can be added to this command
NOTE If you re using the Exchange Management Console to create a new storage group, no options
exist to enable SCR All SCR-related configuration is done using the Exchange shell To enable SCR for an existing storage group, use the following command:
Enable-StorageGroupCopy "Server\Storage Group Name" StandbyMachine "Standby Server Name"
NOTE The storage group path on the SCR target must match the one on the SCR source If the store
(EDB) is located at D:\First Storage Group\Database, and the transaction logs at E:\First Storage Group\Logs, SCR will replicate these to the exact same paths on the SCR target If those paths are not available on the target, the preceding command will fail Additionally, the folders must not contain any Exchange databases or transaction logs on the target server
After SCR is enabled, you would want to find out the replication status If you try to do this right after enabling SCR, you may not see much activity if the source storage group has fewer than 50 transaction logs Once the log replication starts, you will see the replay queue build up Remember, the default replay log time of 24 hours means no logs will be replayed to the target database until that time has elapsed To verify the status of SCR replication, use the same Get-StorageGroupCopyStatus command used for LCR and CCR, with the StandbyMachine parameter (see Figure 19-14):
Get-StorageGroupCopyStatus "Server\Storage Group" StandbyMachine "Standby Server Name"
The result displayed is similar to the output for the LCR and CCR replication status, when the command is used without the StandbyMachine switch Note that the copy queue length and the replay queue length are shown separately Using the preceding command and formatting the output as a list displays more detailed replication statistics
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