[Users] Ipa server inside ovirt itself. ..

Hello, I have a test environment where I am short of hw. My engine is based on fedora 18 and I would like to test freeipa on centos 6. What are the drawbacks of creating a vm that is also one authentication domain for ovirt itself (apart the obvious ones)? Can i set it so that is the first to start? Can i set a subset of VMs to start only if this one is up and is giving ipa service (for example through a test connect command? ) Thanks Gianluca