Topic Last Modified: 2010-02-15

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager includes a performance data collection engine that is used to query performance counter objects on computers running Exchange 2010. For this Operations Manager rule, data is collected by using the performance counter specified in the Details table.

To review the value of the performance counter that generated this alert, in Operations Manager, double-click this alert, and then click the General tab. Review the description of the alert that includes the variables specific to your environment.


Product Name


Product Version

14.0 (Exchange 2010)

Object Name


Counter Name

% Free Space

Instance Name


Sample Interval


Server Role

Ex14. Common

Rule Path

Microsoft Exchange Server/Exchange 2010/Common Components/Server

Rule Name

Disk % Free Space low - Yellow(<15%).


The % Free Space performance counter displays the percentage of disk space that is available on a specific disk.

This alert indicates that the disk specified has less than 15 percent of free space available. Other symptoms you may experience when you reach this threshold are inability to move files to this disk, or inability to move mailboxes to this database, if this disk contains mailbox database files. If this is a Hub Transport or Edge Transport server, it may also experience back pressure.

User Action

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

  • Delete any unnecessary files from the disk.

  • Move data that can be safely moved to another location.

  • Add disk capacity to the server.

  • If the disk that is specified contains mailbox or public folder database files, consider moving large mailboxes or public folders to a different database or a different server that has more disk space available, and then perform an offline defragmentation to compact the databases. For more information about how to do this task, see the following topics:

    • Create a Local Move Request

    • Move Public Folder Content from one Public Folder Database to Another Public Folder Database

    • Eseutil /D Defragmentation Mode.

  • If the disk that is specified contains mailbox or public folder database log files, consider running backups more frequently. One of the functions performed at the end of a successful full or incremental backup is the truncation of transaction log files that are no longer needed for database recovery. For more information, see Understanding Backup, Restore and Disaster Recovery.

  • If the disk that is specified contains Transport queue database or Transport database transaction logs, you may want to change the location of the queue database files if you are also experiencing queues backing up on this server. For more information, see Change the Location of the Queue Database.

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

For More Information

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.