Disk input/output (I/O) error


Topic Last Modified: 2007-11-16

The Microsoft Exchange Server 2007 Management Pack for Operations Manager 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 Operator Console, select this alert, and then click the Properties tab.

  • Review all events that have been logged that meet the criteria of this Operations Manager alert. From the Operator Console, click the Events tab, and then double-click the event in the list for which you want to review the event description.


Product Name


Product Version

8.0 (Exchange Server 2007)

Event ID


Event Source


Alert Type

Critical Error

MOM Rule Path

Microsoft Exchange Server/Exchange 2007/Mailbox/Information Store

MOM Rule Name

Disk input/output (I/O) error.


This event indicates a generic error. The Extensible Storage Engine (ESE) was called by the Microsoft® Exchange Information Store service and received an error from the operating system when the ESE tried to read or write to a file. The file could be a database file, a transaction log file, or a checkpoint file. This event will cause the affected databases to dismount. Users who have mailboxes on the dismounted databases will be unable to send or receive e-mail.

User Action

To resolve this issue, follow one or more of these steps:

  • Look for related ESE events in the Application log. The related ESE events will give you the specific file name and the specific operating system error.

  • If the issue persists, contact Microsoft Customer Support. For information about how to contact support, visit Microsoft Help and Support.

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 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.