1) stop mysqld (redhat: "/etc/rc.d/rc5.d/S90mysql stop"
2) move the entire mysql directory to /usr/lib/mysql
3) update the mysql start script and set the "datadir" to be the new location for the mysql db files
(ie update: /etc/rc.d/rc5.d/S90mysql, datadir=/usr/lib/mysql)
4) start mysqld (redhat: "/etc/rc.d/rc5.d/S90mysql start")