I need to migrate a large (30G) database from 4.1 to 5.1 on a live
system that cannot afford a large amount of downtime. The official
method (copy files, run mysql_upgrade...etc) is looking like it will
take forever, particularly since I need to move it 5.0 before 5.1. How
do people normally manage this in a high availability environment?
One idea being floated is to set up slave running 5.1 to replicate off
4.1 and then cut it over to being the master when we're ready to
migrate... is this feasable or dangerous?
Anyone else who's dealt with this kind of migration before have any
Thanks in advance.