FSMO-roles on physical or virtual DC

Hi.

Wehave a HA clusteron ESXi5.1., aWindows 2008 R2domainwith a total of3DC, 2 virtual and1on physical hardware. All three makeDNSand GC.I'm nownotquite sure howI distribute theFSMO rolesto the 3 DCandthe order in whichClients configure theirDNS Server search.

Spontaneously Iwould sayall theFSMO rolesto the physicalDCandspecify itasthe primary DNS.

Whatare the pros andcontrast?

Andreas