I recently, yesterday, had my SQL drives filled on my SCCM server. After much googling, I was able to "fix" the problem:
Log into SQL server management.
Expand databases
Report Server-Right click Properties
Options- Change recovery model from full to simple.
This shrank the Reporting database from over 330gb down to under 300mb. I also then took the time to change the file limit size for the database from the default 2TB to 200gb.
My question for the SQL people. What could have caused this to happen? I have had zero issues with my SCCM server for 2+ years. The problem is fixed, I am now trying to figure out what caused the problem in the first place. This is the only instance of SQL I work with, and in 3+ years this has been the first time I have logged into the SQL management studio to even work on or change anything.