Microsoft Exchange Server transaction log files are very crucial when it comes to working of the server. This application assigns and follows a particular sequence to name its log files. However, if the log file naming approaches 0xfffff, for instance Edbfffff.log, serious problems can occur. Information Store may stop working and database(s) may fail to mount. To prevent such events from occurring, you should reset the naming sequence periodically, otherwise you will have to use Exchange Server Recovery tools.

For better understanding of the subject, consider, you as an Exchange Server administrator, are not aware of the fact that resetting the log sequence is necessary, and, you suddenly observe that the Information Store has stopped functioning or is not working correctly for no apparent reason. Additionally, when you view the application log, you receive the below mentioned log:

Event ID: 125
Event Source: ESE97
Event Type: Error
Description:
MSExchangeIS () Unable to create the log. The drive may be read-only, out of disk space, misconfigured, or corrupted. Error -519.

Further, when you try to start the Information Store, the following event entry is received in the application log:

Event ID: 7024
Event Source: Service Control Manager
Event Type: Error
Description:
The Microsoft Exchange Information Store service terminated with service-specific error 4294966786.

Thus Information Store is not accessible by any means.

Cause

As mentioned earlier, the above behavior can result if the log file name sequence of Information Store transaction logs has reached the maximum value of Edbfffff.log.

Solution

You can implement any of the applicable methods to isolate the given issue:

  1. Check for an offline backup. If present, use it to restore affected Information Store databases
  2. If no suitable backup is available, perform hard repair on databases. For this, you need to run eseutil /p, eseutil /d, and isinteg utilities. But keep in mind to backup your database first, as hard repair can delete important pages from your databases.
  3. Use a third-party Exchange Recovery Software to repair and restore corrupted Information Store databases. These Exchange Server Recovery software are more effective and safe than Exchange Server repair utilities.

Exchange Recovery Tool is a reliable utility that repairs corrupted Exchange Server databases and restores their mailboxes as PST files to a secure location, which is specified by the user. This Exchange Recovery software supports MS Exchange Server 2007, 2003, 2000, and 5.5.