I'm very skeptical about this i mean bind has worked for me for years (if it's not broken don't mess with it) however i want to enable dnssec and cPanel only supports that with powerdns .I am wondering if the switch is *really* as simple as choosing Powerdns in the "nameserver selection" interface in whm ? also i use AXFR transfers to secondary dns servers will that be broken ??
I can only answer the first part of your question, but the general answer is yes. PDNS is compatible with a whole bunch of 'back ends'. cPanel choose to implement it with a bind back end. So what basically happens is that bind gets shut down, PDNS gets started and it's configured to read the exact same zone files that bind was reading. All of the underlying cPanel "stuff" still thinks its using bind/wring bind zone files.