Comment 2 for bug 1270875

Please consider the following tuning as well
http://www.percona.com/live/nyc-2012/sessions/galera-cluster-best-practices
- use wsrep_sst_xtrabackup instead of wsrep_sst_mysqldump we are using atm (fuel/deployment/puppet/galera/templates/wsrep.cnf.erb:wsrep_sst_method=mysqldump)
- use dedicated reference node for full-state transfer donor and backup activities