The SQL and Exchange transaction logs may not get truncated even after a successful backup in BESR 6.x when the logs are being stored on a Net Appliance device or other such device that has its own version of VSS.  BESR uses the Microsoft Windows version of VSS to send the code to shut down the database.  If the Net Appliance device has its own version of VSS it will reject the VSS call from Microsoft, preventing the transaction logs from getting truncated.

Run the following command to determine the version of VSS running on the Net Appliance server:


vssadmin list providers > c:\vsswriters.txt

This command will provide a list of all VSS providers on the system.


Workaround:

Store the transaction logs on a Net Appliance device or other such device that does not have its own version of VSS.

Resolution:

Upgrade the current installation to BESR 7.0 as this issue has been fixed in BESR 7.0 and later.