We are working on Tableau Server 10.0 . We have upgraded from 9.3 to 10 three months ago , since then everyday the size on the disk is getting doubled.When I checked on to the server portal "Stats for Space Usage" is 10 times less than what is on the disk.
Do you see a noticeable difference in the amount of storage taken up after running the cleanup commands? If so, you may need to change the amount of time temporary files are stored for. Also, could you post the exact version number of Tableau Server in use?