...
While there are many MySQL-based clustering solutions available, Ubersmith presently supports and advocates the use of Percona XtraDB Cluster.
Percona XtraDB Cluster is an active/active high availability and high scalability open source solution for MySQL clustering. It integrates Percona Server and Percona XtraBackup with the Galera library of MySQL high availability solutions in a single package [...]
...
Ubersmith is now back online using Percona XtraDB Cluster.