large fimDiagnostics.svclog file

In our Sharepoint 2010 SP2 environment, we started getting pretty low on space on C drive.  After some investigation, we found out that we have an almost 60GB file fimDiagnostics.svclog in

C:\Program Files\Microsoft Office Servers\14.0\Service

I believe this file is used by Forefront Identity Manager 2010.  We don't have a standalone version of FIM, just whatever comes with Sharepoint.  Is there any way to reduce the size of this file and modify how much information is written to it in the future?

thanks