Article ID: 980262 - Last Review: March 4, 2010 - Revision: 1.0

Event ID 2156 is logged on a computer that is running Exchange Server 2010

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SYMPTOMS

On a computer that is running Microsoft Exchange Server 2010, the following error message is logged in the Application log:

Log Name:      Application
Source:        MSExchangeRepl
Event ID:      2156
Task Category: Service
Level:         Error
Keywords:      Classic
User:          N/A
Description:
The log copier for database '<database name>' could not send a log file to server '<target server which hold the passive copy>' because an I/O error occurred while attempting to access file '<database log file>' on source server <the server which holds the active copy>. Error: The request could not be performed because of an I/O device error.

After this error message is logged, you cannot move the database or copy a log file.

Note This problem may be caused by a hard disk issue. You can determine whether this problem is caused by a hard disk issue by checking the system event logs. If this problem is caused by a hard disk issue, change the hard disk and install the hotfix that is mentioned in the "Resolution" section.

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CAUSE

When you copy a log file from the active copy to the passive copy, the Exchange Server 2010 server tries to verify the log file first. If the log file has a destroyable block that is caused by a hard disk issue, the read operation fails. Additionally, an I/O exception is generated and replication stops. In this situation, a cluster failover should occur on the Exchange Server 2010 server. However, a cluster failover does not occur as expected. Therefore, the log file is locked.

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RESOLUTION

To fix this problem, install Update Rollup 2 for Exchange Server 2010.
For more information about Update Rollup 2 for Exchange 2010, click the following article number to view the article in the Microsoft Knowledge Base:

979611 (http://support.microsoft.com/kb/979611/ ) Description of Update Rollup 2 for Exchange Server 2010: February 18, 2010

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