do you host all the dns on the dns cluster ?
or each server have their own dns ?
if each domain only put all the websites data/service on one server,
i think it is non-necessary to host the domain on dns cluster,
because if the web server fail,
all the service can not show even if you host dns out out the server.
and i ever find certain registrar's dns under ddos,
and all the domain forward/sub domain/a address record setup on their dns are fail,
all ns1/ns2/ns3/ns4 under attack,
if all your client's domain host on it and can not work,
i think it is big issue at all...
but setup separate dns for each server,
i will need to waste more ip i think,
becuase at least you need two ip as dns for each server.
for your experience,do you recommend which one way?