artifact cache on teamcity 9

Hello,

On our build agents the system/.artifacts_cache directory gets very large. I've tried to limit the size this grows to by adding the following configuration item to conf/buildAgent.conf:

teamcity.agent.filecache.size.limit.bytes=3573741824

The intention with this would be to limit the size to 3.5GB however this does not seem to be happening. Any way I can enable this kind of behaviour?

James