check for any directory such as DAA in /usr/sap or check user daaadm.
check sapmmc or best check your file system:)
You send your system information to SLD.
Diagnostic agents sends diagnostic data to solution manager.
Please don't interrelate SLD registration with Managed system configuration.
When you register any system in SLD you can see information such as system's component levels and this system is used to solution manager for the lifecycle of your system - for eg, generating stack files.
Regards,Divyanshu