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C AUTION To manually reseed using this option, replication needs to be suspended first and the
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database taken offline Yet another option to reseed is to disable LCR and enable it again
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Disabling LCR
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LCR can be disabled on a storage group using the EMC Select the storage group and click the Disable Local Continuous Replication link in the Action pane To disable LCR using the shell, use the following command:
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Disable-StorageGroupCopy "E12Postcard\E12Postcard-SG4"
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All the technical jargon, detailed descriptions, and procedures outlined so far are of little use unless you need to switch to the replica copy at some point This may be necessary if the active copy of the storage group is corrupt, or if the volumes on which these reside decide to prove the Mean Time Between Failure (MTBF) statistics cited by storage vendors is nothing but wishful thinking At such times, the first step should be assessing the cause of the damage and the health of the replica The latter can be done using the Get-StorageGroupCopyStatus command or the EMC, as described earlier in this section
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You can activate the replica in a number of ways: Similar paths used by the active storage group and LCR replica The paths used by the active copy of the storage group/database are the same, except the drive letter, as in the following example:
Copy Active LCR replica Storage Group System and Log Files D:\SERVER1-SG1 F:\SERVER1-SG1 Database E:\SERVER1-SG1-MBX1\SG1-MBX1EDB G:\SERVER1-SG1-MBX1\SG1-MBX1EDB
In this case, you can simply use the Disk Management console to change the drive letter assignments A similar change can also be done if volume mount points are used the mount point assignments can be easily reconfigured Move files This involves copying files from the LCR replica location to the location of the active copy Copying large databases can take much longer, with every minute counting against your SLA performance not something management likes to see Change paths The preceding methods make activation of the replica possible without changing the storage group configuration in AD it still points to the same path of the active copy Another quick alternative is to simply change paths and point Exchange to the replica Although Microsoft doesn t recommend it, there is no particular reason for not choosing this method The downside: Another administrator may be surprised to come back to work and find the storage group files now reside in F:\Local Copies\SG1 and the database in G:\Local Copies\ SG1-MBX1EDB However, with adequate change control procedures, communication, and documentation, this should not be a major issue Plus, it has the advantage of providing the quickest and most automated recovery The actual method used will differ in each case, depending on what s easier and quicker to accomplish in your configuration The mission: Minimize downtime Use the following procedure to activate the replica: 1 If the Database is still mounted, dismount it using the EMC or the DismountDatabase command from the shell 2 Prepare the replica to be mounted If changing drive letter assignments, reconfiguring volume mount points, or copying files from the replica to the original location, use the following command:
Restore-StorageGroupCopy "E12Postcard-SG4"
NOTE After the preceding command is used, perform the appropriate disk management procedure to
ensure the storage group and database files from the replica magically appear in the original location, unless the ReplaceLocations switch will be used to change paths If you re changing the storage group and database paths, use the following command (see Figure 19-4):
Restore-StorageGroupCopy "E12Postcard-SG4" ReplaceLocations $true
19:
H i g h Av a i l a b i l i t y
FIGURE 19-4
Using Restore-StorageGroupCopy with ReplaceLocations switch
3 The database is now ready to be mounted using your tool of choice the EMC or the Mount-Database command from the shell 4 If the original or additional volumes are available, enable LCR again to create a new replica To set up LCR again for the storage group, use the Enable-DatabaseCopy command to enable LCR for the database, and use Enable-StorageGroupCopy for the storage group If the volumes containing the logs and database from the formerly active copy are available, you can use the same paths used earlier (in effect, reversing the direction of LCR replication this time, from the now-active copy to the paths used by the previously active copy) This will avoid reseeding If the database was dismounted because of corruption, reseeding will be required The logs and database on that volume will need to be deleted If new disk volumes are being used, the database will be seeded 5 (Optional at this point) If the MTBF figures cited by the storage vendor proved to be hot air, send them an e-mail Brag to your manager as well as their manager about the less-than-X-seconds/minutes of downtime your well-planned and well-implemented Exchange deployment suffered Ask for a day off, as you prepare to receive the most valuable employee of the year award from the CEO! (Recommended: Send a thank you e-mail to the Exchange marketing gods for not requiring an Enterprise edition license to use LCR) It s not hard to see why LCR (and other replication features) has many Exchange administrators and messaging teams excited
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