%1 (%2) %3Database %4 requires log files %5-%6 in order to recover all committed data. Recovery could only locate up to log file %7, and could not locate log generation %8. If the log file cannot be found, the database(s) can be recovered manually, but this will result in losing committed data.

Details
Product: Exchange
Event ID: 523
Source: ESE
Version: 8.0
Symbolic Name: REDO_MISSING_COMMITTED_LOGS_BUT_HAS_LOSSY_RECOVERY_OPTION_ID
Message: %1 (%2) %3Database %4 requires log files %5-%6 in order to recover all committed data. Recovery could only locate up to log file %7, and could not locate log generation %8. If the log file cannot be found, the database(s) can be recovered manually, but this will result in losing committed data.
   
Explanation

This Error event indicates that log files that are in the Lost Log Resilience (LLR) range are missing. LLR is a feature of Microsoft Exchange Server 2007 that drastically reduces the occurrence of database inconsistency due to lost logs.

   
User Action

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

  • Try to locate the missing log files and place them in the correct log file path and run database recovery either via the database mount or via the Eseutil /R option. For more information, see How to Mount a Database in a Cluster Continuous Replication Environment and How to Run Eseutil /R (Recovery).

  • If the missing log files cannot be located, the recovery can be achieved via running Eseutil /R /A at the expense of the data in the missing log files.

    If the missing log files are found after running Eseutil /R /A, those transactions cannot be recovered into the database anymore.

  • If the database recovery is successful, you should see Event 524 in Event Viewer.

  • If you are still having difficulty resolving the issue, contact Microsoft Product Support. For information about contacting support, visit the Contact Us page of the Microsoft Help and Support Web site.

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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