Bao,
There are a few fixes we need to add to the F5 Management Pack prior to have basic clustering support even for a clusterd self-containted RMS (with no Management Servers). There's no configurable hostname setting for getting the [SCOM] Health Service hostname, inside the F5 Management Pack (F5 MP). The Health Service hostname is dynamically retrieved inside our F5 MP, using various API calls, and some of them would simply ignore clustered environment configuration settings (as initially the F5 MP has not been targeted to support MS cluster deployments). We are looking into making these changes into our F5 MP and add basic clustering support in one of our upcoming releases.
Julian