… we’re comparing here – it is mainly DRBD to MySQL Replication based techniques (lets leave MySQL Cluster and Continnuent alone for a while as… node failure. This actually goes to two topics. First – hot vs cold. If you’re using decent hardware and care about… transaction loss and automated fail over. Whenever you’re using MySQL Cluster, DRBD or MySQL Replication you have to have some compromises.
Post: State of MySQL Market and will Replication live ?
… as $/visitor or $revenue/server the difference for most enterprises vs most of web applications in insane. Not only that but… scale MySQL and get some HA out of the box even on the medium level. Seriously – MySQL Cluster, Continuent, Master-Master Replication, DRBD or… ? From MySQL side we have further development of MySQL Cluster to be more usable for web apps as well as development of MySQL Proxy…

