Sometimes you may encounter that one of your Lync FE server is chewing up more space  on C:\ Drive as compare to other servers.

This is because there is a hidden Windows Fabric folder that is accumulating log files. Here is the location:

C:\ProgramData\Windows Fabric\Fabric\log\Traces

In this folder you will have .etl files like as under.


The problem here is each time the log file reaches 128MB it creates a new one.

Solution:- Either you have to delete it manually which is not possible for large scale organization or you can set Circular logging from command prompt. like as below.

Logman update trace FabricLeaseLayerTraces -f bincirc --cnf

Basically this command will change the logging to circular.

 –cnf is used to “create a new file when the log size has been exceeded”.