Red Hat High Availability

Hi,,,

I'm planning to install red hat cluster/ red hat high availability in 2 - 4 servers Dell R520. does anyone know what is the best method for fencing the cluster in these servers ? and what red hat version should i install, 6.3 or 6.4 or maybe 6.5 ? is it support the fence method using drac ? and for this type server Dell R520, it is using iDrac version 7, is it supported by red hat fence agent ?

Thank You.

Best Regards,
Aldi