Архивы флэш-памяти Соляриса могли бы быть тем, что Вы ищете. http://download.oracle.com/docs/cd/E19683-01/816-7171/6md6pohot/index.html
It would be easier to change take the IP from the loadbalancer - the state full connections will complete and the new ones will be just redirected to the other MySQL server . When you can not see any more connections on the MySQl server that must be maintained , change the IP , restart the server , add the server back to the HA . Please check this as this solution really depends on the environment