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    Arrow How to work with Recovery Storage Groups at Exchange server 2007.


    The Recover Storage Group (RSG) feature, which was originally introduced back in Exchange 2003, gives you as the Exchange administrator, the option of mounting a second copy of a mailbox database (typically a mailbox database restored from backup) so that you can extract data from one or more mailboxes in the respective database without affecting the production databases if you need to do so during working hours.
    Depending on how much you have used the new Exchange 2007 Management Console (EMC), theres a chance you may have noticed you can no longer create an RSG from within the EMC. With Exchange 2007 this is instead done using the Exchange Troubleshooting Assistant (ExTRA) which is launched via the Database Recovery Management tool, which is found under the Exchange Toolbox work center, or by using the Exchange Management Shell (EMS).
    When mounting a copy of a Mailbox database to an RSG you can extract the data from a mailbox and then merge the data with another mailbox located in a mailbox database in a production Storage Group, but you can also extract the data and then copy it to a specific folder in another mailbox.
    With Exchange 2003 RTM, the data was extracted, copied and merged with another mailbox or mailbox folder using the Microsoft Exchange Server Mailbox Merge Wizard (ExMerge) tool, but with Exchange 2003 SP1 the process was integrated in the Exchange 2003 System Manager GUI.
    Recovery Storage Group Limitations

    There are a few things you should be aware of when dealing with RSGs. First they cannot be accessed by any protocols other than MAPI, and although they can be accessed using MAPI this doesnt mean you can connect to a Mailbox stored in a recovery database using an Outlook MAPI client. MAPI is strictly used to access mailboxes using the Exchange Troubleshooting Assistant (ExTRA) and/or the respective cmdlets in the Exchange Management Shell. In addition you should be aware that you still cannot use RSGs to restore Public Folder data but only mailbox data. Its also worth mentioning that even though you can create up to 50 Storage Groups on an Exchange 2007 Enterprise edition server, youre limited to one RSG per server, but its supported to add multiple mailbox databases to an RSG as long as all databases belong to the same Storage Group. Finally you should note that although its possible to add a restored mailbox database to an RSG on another Exchange 2007 server, its important to understand that the Exchange 2007 server must belong to the same Active Directory forest.
    Managing Recovery Storage Groups using the Exchange Troubleshooting Assistant

    You can create a Recovery Storage Group (RSG) either by using the Microsoft Exchange Troubleshooting Assistant (ExTRA) tool, or by running the New-StorageGroup cmdlet with the Recovery parameter in the Exchange Management Shell.
    To create the RSG using ExTRA you should first launch the tool by opening the Database Recovery Management tool found under the Toolbox work center in the navigation tree of the Exchange Management Console (EMC). Now let the tool check for any tool or configuration file updates that may be available then click the Go to Welcome screen link. Now enter an indentifying label for this activity (such as Create RSG) then click Next. On the appearing Tasks list click Create a Recovery Storage Group then select the Storage Group you want to link with the Recovery Storage Group as shown in Figure 1, then click Next once again.

    Figure 1: Selecting the Storage Group to link with the RSG
    Now its time to create the RSG, but before you do so you need to give it a name (the default name is Recovery Storage Group which should be ok in most situations). When you have entered an appropriate name, click Create the recovery storage group (Figure 2).

    Figure 2: Creating the RSG
    After a little while you will be presented with a screen similar to the one in Figure 3 and the RSG for the respective Mailbox Database has now been created.

    Figure 3:
    RSG Result
    With the RSG created we can move, copy or restore database and transaction log files to the recovery storage group paths. To see the path for the recovery storage group log and database files, click Show Create Recovery Storage Group Information. By default the path is C:\Program Files\Microsoft\Exchange Server\Mailbox\\RSGxxxxxxxxx as you can see in Figure 4. The RSGxxxxxxxxx folder will appear empty in Windows Explorer until you have either moved, copied or restored the database and transaction log files to it.

    Figure 4: Storage Group and Recovery Storage Group Paths
    For the purpose of the example in this article, we will restore a Mailbox Database from a backup using the Windows 2003 Backup tool. So lets launch the Windows 2003 Backup tool by clicking Start | Run and typing cmd.exe followed by hitting Enter. Since we will restore the Mailbox Database by using this tool in Advanced Mode, click Advanced Mode. Now select the Restore and Manage Media tab. Here we need to select the Mailbox Database and Log Files we want to restore, when you have done so click the Start Restore button.
    The Restore files to: drop-down box is set to Original location. Also notice we cannot change this selection. But does this mean the Mailbox Database currently in production will be replaced with the one we restore from backup? No this is not the case, first we havent dismounted the production Mailbox Database and second we havent enabled the This database can be overwritten by a restore option on the Mailbox Database property page. Because of this the Mailbox Database will be restored to the Recovery Storage Group which we just created.
    Now specify the Exchange Server to which you want to restore the respective Mailbox Database, then enter a temporary location for the log and patch files. Lastly check Last Restore Set (Log file replay will start after this restore completes.) as this is the last restore set. When you have done so, click OK and wait for the restore job to complete then click the Close button.
    The respective files have now been restored to the RSGxxxxxxxxx folder as you can see in Figure 5.

    Figure 5: Restored Mailbox Database in Windows Explorer
    Since we didnt check the Mount Database After Restore option, the Mailbox Database will now be in a dismounted state, with this in mind lets switch back to the ExTRA Task Center. As shown in Figure 6 we now have several new Recovery Storage Group related tasks available, since the Mailbox Database needs to be mounted before we can extract data from it, we have to click Mount or dismount databases in the recovery storage group.

    Figure 6: Selecting Mount or dismount databases in the recovery storage group
    On the Mount or Dismount Database page, check the Respective Mailbox Database and click Mount selected database (Figure 7).

    Figure 7: Mounting the Mailbox Database using the ExTRA Tool
    When the Mailbox Database has been mounted click Go Back to task center and then select Merge or copy mailbox content. This will bring us to a screen similar to the one shown in Figure 8, here you should just make sure the Mailbox Database you wish to extract data from is selected, and then click Gather merge information.

    Figure 8: Selecting a Mounted Database in the Recovery Storage Group
    We now have the option of swapping the Mailbox Database mounted to the RSG and the linked production Mailbox Database (a recommended step if youre performing a dial-tone database restore) by checking Swap database configurations as can be seen in Figure 9. Since this option will swap the two databases, both of them needs to be dismounted, which will affect mail service to the end-users whose mailboxes are stored in the respective database.
    Since we arent dealing with a dial-tone database restore in this example just click Next.

    Figure 9: Database Swap Option
    On the Select Merge Options page we should click Perform pre-merge tasks (Figure 10).
    Note that you have the option of clicking Show Advanced Options. Under the Advanced options we can specify different match and filtering options as well as the bad item limit. This is also the place where you specified whether all merge mailbox data should be merged to the respective mailboxes in the production Mailbox Database or should be copied to a single target mailbox.

    Figure 10: Specifying Merge Options
    Final step is to select the mailboxes you want to merge. You do this by checking the box to the left of each user name in the list as shown in Figure 11.

    Figure 11: Selecting the Mailboxes to Merge
    Now wait for the tool to merge the mailbox data from Mailbox Database in the Recovery Storage Group for the selected mailbox. When the mailbox data merge has completed, you should be able to see the content that was deleted from the production Mailbox Database. You dont even need to restart the Outlook or OWA client for the restored data to appear!
    When you have merged or copied the required Mailbox data, you can use ExTRA to dismount and then remove the Recovery Storage Group. Be sure you remove the files in the RSGxxxxxxxxx folder again after you have removed it, so that the files dont take up valuable disk space.

    Working with Recovery Storage Groups using the Exchange Management Shell

    As mentioned in the introductory, you can also manage an RSG using the Exchange Management Shell (EMS). If you have a fair amount of experience working with cmdlets, restoring mailbox data from a Mailbox Database in a Recovery Storage Group can be done a lot faster than when using ExTRA.
    The first step is to create the RSG. In order to create an RSG via the EMS you need to run the New-StorageGroup cmdlet with the Recovery parameter. So to create a RSG for the First Storage Group on a server named E2K7S04, type:
    New-StorageGroup Server E2K7S04 LogFolderPath E:\Program Files\Microsoft\Exchange Server\Mailbox\First Storage Group\RSG Name Recovery Storage Group SystemFolderPath E:\Program Files\Microsoft\Exchange Server\Mailbox\First Storage Group\RSG Recovery
    The LogFolderPath and SystemFolderPath parameters are used to specify where the RSG related files should be located. As you can see, we specified they should be restored to a subfolder called RSG under E:\Program Files\Microsoft\Exchange Server\Mailbox\First Storage Group\RSG. If you intend to do the same please make sure theres sufficient disk space available for the Mailbox Database youre restoring from backup.
    To see if a respective Storage Group is a Recovery Storage Group (as well as many other types of information) you can use the Get-StorageGroup | FL command. If the Storage Group is a Recovery Storage Group it will say True under Recovery as shown in Figure 12.

    Figure 12: Full List of Recovery Storage Group information
    The next step is to add a recovery database (either moved, copied or restored from backup) to the RSG, this is done by running the New-MailboxDatabase cmdlet with the MailboxDatabaseToRecover parameter. So to add a recovery database to the Recovery Storage Group on a server named E2KS04 with the edb file path pointing to E:\Program Files\Microsoft\Exchange Server\Mailbox\First Storage Group\RSG, type:
    New-MailboxDatabase MailboxDatabaseToRecover Mailbox Database StorageGroup E2K7S04\Recovery Storage Group EDBFilePath E:\Program Files\Microsoft\Exchange Server\Mailbox\First Storage Group\RSG\Mailbox Database.edb
    With the Mailbox Database created in the Recovery Storage Group we now need to configure it to allow overwrites by running the Set-MailboxDatabase cmdlet with the AllowRestore parameter. To allow file restores for the recovery database just created, type:
    Set-MailboxDatabase -Identity "E2K7S04\Recovery Storage Group\Mailbox Database" -AllowFileR
    estore $true
    Now that we have created a recovery database in the Recovery Storage Group and allowed it to be overwritten by a file restore, its time to restore the mailbox database version from which you want to extract and copy or merge data to the mailbox database in production. To do so launch the Windows 2003 Backup tool and restore the respective Mailbox Database version using the same steps as we did when we used the ExTRA to recover Mailbox data.
    We now need to mount the restore Mailbox Database using the Mount-Database cmdlet. In order to do so type:
    Mount-Database Identity E2K7S04\Recovery Storage Group\Mailbox Database
    With the Mailbox Database mounted we can now extract Mailbox data from it. If you for example want to merge the mailbox data of an existing user in the recovery database to the production mailbox database, you need to type:
    Restore-Mailbox Identity -RSGDatabase servername\RSG name\database name
    In Figure 13 we recovered mailbox data for a user called Test User 1on a server name E2K7S04.

    Figure 13: Restoring Mailbox Data from a Mailbox in a Recovery Storage Group
    Depending on the size of the mailbox that is to be recovered, this merging process can take a long time.
    If you need to recover mailbox data for all users in the RSG, you would need to use the following command:
    Get-MailboxStatistics -Database Recovery Storage Group\Mailbox Database | Restore-Mailbox
    Lets suppose the mailbox in the recovery database from which you want to recover data in the meanwhile has been deleted from the production mailbox database. In this case you have the option of recovering the mailbox data to a target folder in another mailbox by using the following command:
    Restore-Mailbox RSGMailbox Test User 1 -RSGDatabase servername\RSG name\database name Identity Test User 2 TargetFolder Test User 1 Recovered data
    Like is the case when recovering data using the ExTRA tool, you should, when using the Exchange Management Shell, remember to remove the RSG after the required data has been recovered. To do so, first run the command to remove the recovery database:
    Remove-MailboxDatabase Identity E2K7S04\Recovery Storage Group\Mailbox Database
    Click Yes to the confirmation warning, then type the following command in order to remove the RSG:
    Remove-StorageGroup Identity E2K7S04\Recovery Storage Group
    Finally delete the RSG folder manually using Windows Explorer.

    Mohamed Fouad
    Technical Team Leader
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  6. #2
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    Best Regards,
    Security Engineer

    eljoker70000 :

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    I think that it was a very nice and knowlegeable post which tells about the Recovery Storage group , I had a similar type of the problem where my EDB files of Exchange 2007 got corrupted and I have to repair and recover these corrupted files using a third party tool Through this tool I easily able to recover in my EDB and then convert it into PST format.


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