We are currently investigating moving our current
MySQL 5.5 Master > 5 x Slaves (with Statement Based Replication, apx 250GB data and growing) to a HA clustering option. Mainly to provide greater resilience, write scaling, and easier to carry out admin stuff like Optimising tables without taking the master offline.
We have ruled out (for the moment)
MySQL ndb Cluster as it would require too many changes to our current database structure (large number of BLOB fields amongst other problems).
So we are looking at either Galera Cluster or Percona Cluster as the alternatives, as the they seem to do what we want, without 'too' steep a learning curve.
We would want to start off by setting the Cluster up as a Slave to the main Master (for testing etc), before moving over to the Cluster as our Primary system in the future. Is this possible? Reading through the documentation doesn't seem to really talk about this side of things (unless I've missed it).