An attempt to prepare the storage group ‘%1’ for backup failed because the storage group is already in the process of being backed up. The error code is %2. (Note that if a backup was recently aborted, then it may take several minutes for the system to detect the aborted backup and initiate backup cleanup procedures, so this message may be generated if an attempt was made to backup a storage group before a previous backup attempt had fully terminated.)

Details
Product: Exchange
Event ID: 9840
Source: MSExchangeIS
Version: 8.0
Symbolic Name: msgidSGBackupInProgress
Message: An attempt to prepare the storage group ‘%1’ for backup failed because the storage group is already in the process of being backed up. The error code is %2. (Note that if a backup was recently aborted, then it may take several minutes for the system to detect the aborted backup and initiate backup cleanup procedures, so this message may be generated if an attempt was made to backup a storage group before a previous backup attempt had fully terminated.)
   
Explanation

This Error event indicates that an attempt to perform a backup operation failed. This event occurs when you try to perform a Volume Shadow Copy Service (VSS) backup of a mailbox database or of a public folder database in Microsoft Exchange Server 2007.

This problem may occur if the following conditions are true:

  • VSS uses the Microsoft Jet database engine to freeze or thaw a snapshot backup.

  • The Jet database engine encounters an error.

  • The Jet database engine silently frees all storage groups from the snapshot session when the error occurs.

When these conditions are true, the Jet database engine does not report the correct status of these storage groups to Exchange 2007. Therefore, Exchange 2007 does not reset the backup-in-progress state. If you try to back up the affected storage group again, the symptoms that are described in the “Symptoms” section occur.

   
User Action

To resolve this error, do one or more of the following:

  • Dismount all databases in the storage group. For more information, see How to Dismount a Database.

  • Restart the Microsoft Exchange Information Store service.

For more information, see Microsoft Knowledge Base article 930800, Event ID 9840 is logged when a VSS backup operation fails in Exchange 2007.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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