Event ID 2168 is logged when you try to back up Exchange data from a DAG in an Exchange Server 2010 SP1 environment

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Article ID: 2476973 - View products that this article applies to.
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Consider the following scenario:
  • You create a database availability group (DAG) that contains two or more member servers in a Microsoft Exchange Server 2010 Service Pack 1 (SP1) environment.
  • You configure replication between the member servers of the DAG.
  • You try to back up Exchange data from the DAG.
In this scenario, the following event is logged in the Application log on the member servers:

Log Name: Application
Source: MSExchangeRepl
Event ID: 2168
Task Category: Service
Level: Error
Keywords: Classic
Log file '<log file>' for database copy '<database copy>' couldn't be read. Error: File '<log file>' could not be opened. The process cannot access the file because it is being used by another process.

Additionally, the backup operation may fail when the backup application tries to access the locked log file.


This issue occurs when the log file is renamed during the backup operation. It takes more than 300 milliseconds to synchronize the new name. This is longer than the time that is expected by the Microsoft Exchange Mailbox Replication Service service. Therefore, the log file is still locked when the backup application tries to access the log file.


To resolve this issue, install the following update rollup:
2529939 Description of Update Rollup 3 for Exchange Server 2010 Service Pack 1


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


For more information about database availability groups, visit the following Microsoft website:
General information about database availability groups


Article ID: 2476973 - Last Review: April 6, 2011 - Revision: 3.0
  • Microsoft Exchange Server 2010 Service Pack 1, when used with:
    • Microsoft Exchange Server 2010 Enterprise
    • Microsoft Exchange Server 2010 Standard
kbqfe kbfix kbsurveynew kbhotfixrollup kbexpertiseinter KB2476973

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