Is it possible to scale the provisioning server on same server ? I mean if I have a provisioning server already installed on a given server, is it advisable to install another instance of provisioning server on same server. Please advise.
If you mean the provisioning server itself, then adding another instance of it on a machine that already has one installed is not supported.
If you mean a provisioning directory, than it is possible if you know your way around the directory configuration.
This is not something that was tested and verified and so we cannot support such a configuration.