clusters.addHost("host1");
clusters.addHost("host2");
clusters.addHost("host3");
Host host = clusters.getHost("host1");
setOsFamily(host, "redhat", "5.9");
host.persist();
host = clusters.getHost("host2");
setOsFamily(host, "redhat", "5.9");
host.persist();
host = clusters.getHost("host3");
setOsFamily(host, "redhat", "5.9");