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Tuesday, 5 November 2013

Exchange 2010 Server Running Out Of Disk Space

We encountered an issue with Exchange 2010 where we were constantly running out of disk space. After investigation we found this was due to the log files rapidly filling as we had more people connecting in via mobile devices.

In order to fix this, you can either enable circular logging via the method below or, preferably, by using an Exchange aware backup tool. Veeam Backup and Replication includes Exchange awareness in the standard licence and is quick to set up. This method is also detailed below;

Enable Circular Logging

Circular logging only allows the transactional log database to grow to 1MB in size. After that limit is reached, earlier logs are deleted in order to make room for new ones. As such this can cause issues when trying to troubleshoot. Microsoft do not recommend using this method.

If you want to go ahead anyway as a stop-gap whilst sourcing an Exchange aware backup tool follow the steps below;

1. Open Exchange Management Console and browse to Organization Configuration > Mailbox
2. Under the Database Management tab, right click your mailbox store and choose Properties
3. Under the Maintenance tab select the check box for Enable Circular Logging
4. You will need to dismount and remount the database for this change to take effect.

To disable circular logging, simply remove the tick from the check box and dismount and remount the database.

Using Veeam Backup and Replication to clear Exchange logs

1. If you do not currently use Veeam to backup your Exchange server, create a new backup job. In order for the logs to be truncated you do not need to backup the entire machine, just the drive containing the mailbox database.
2. When you reach the Guest Processing options, click the Advanced button. Add your Exchange server if it does not appear in the Advanced Options, select the server and click Edit.
3. Under the Transaction Logs section, choose to Truncate logs on successful backup only

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