The log signature of the existing log file does not match log files from the backup set
Topic Last Modified: 2007-11-16
The Microsoft Exchange Server 2007 Management Pack for Microsoft Operations Manager (MOM) monitors the Windows Application log on computers that are running Exchange Server 2007 and generates this alert when the event or events specified in the following Details table are logged.
To learn more about this event, do one or more of the following:
Review the description of the event that includes the variables specific to your environment. From the MOM Operator Console, select this alert, and then click the Properties tab.
Review all events that have been logged that meet the criteria of this MOM alert. From the MOM Operator Console, click the Events tab, and then double-click the event in the list for which you want to review the event description.
Details
Product Name |
Exchange |
Product Version |
8.0 (Exchange Server 2007) |
Event ID |
457 |
Event Source |
ESE |
Alert Type |
Warning |
MOM Rule Path |
Microsoft Exchange Server/Exchange 2007/Common Components/Extensible Storage Engine |
MOM Rule Name |
The log signature of the existing log file does not match log files from the backup set. Exchange fails to replay logs and mount databases. Replay cannot succeed until all signatures match. |
Explanation
This Warning event indicates that the log signature of an existing log file does not match the log files from the backup set. You are restoring to a recovery server that has a different set of log files. Log file replay cannot succeed unless all signatures match.
You will see the following phrase in the event description: Information Store number. The log signature of the existing log file E0n.log does not match the log files from the backup set. Log file replay cannot succeed unless all signatures match.
The E0n.log file (the current log file for the storage group, such as E00.log) has a different log signature than the log files that have been restored from the online restore. A typical scenario is as follows: All the Microsoft Exchange Information Store service files have been removed. In order to restore an online backup of an Exchange server, you must have the Exchange store running. If you have not checked the Do not mount this store at start-up option on the Database tab, and you start the Microsoft Exchange Information Store service, then a new E00.log file is created. The log signature for this file does not match the signatures of the log files from the backup, and the Exchange store fails to replay logs and mount the databases.
User Action
To resolve this warning, do the following:
Disconnect from all the databases in the storage group.
Perform an offline backup and then remove all Exchange store log files and check files for the storage group. Select the Do not mount this store at start-up option on the Database tab for all databases in the storage group.
Start the Microsoft Exchange Information Store service. Clear the Do not mount this store at start-up option on the Database tab for all databases in the storage group. Perform the online restore.
For More Information
To search the Microsoft Knowledge Base articles based on criteria that generated this alert, visit the Search the Support Knowledge Base (KB) Web site.
To review Exchange 2007 event message articles that may not be represented by Exchange 2007 MOM alerts, see the Events and Errors Message Center.
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.