@Jay, If you are upgrading in 55, it will choose Galera-2 by default., so it sticks to default behaviour here. rpm -qa | grep -iE 'percona|mysql' --------------------------------------------------------------- Percona-XtraDB-Cluster-shared-5.5.27-23.6.356.rhel6.x86_64 perl-DBD-MySQL-4.013-3.el6.x86_64 percona-xtrabackup-test-2.0.2-461.rhel6.x86_64 Percona-XtraDB-Cluster-debuginfo-5.5.27-23.6.356.rhel6.x86_64 Percona-XtraDB-Cluster-client-5.5.27-23.6.356.rhel6.x86_64 Percona-Server-shared-compat-5.5.27-rel28.1.296.rhel6.x86_64 Percona-XtraDB-Cluster-galera-2.0-1.114.rhel6.x86_64 percona-toolkit-2.1.3-2.noarch Percona-XtraDB-Cluster-test-5.5.27-23.6.356.rhel6.x86_64 Percona-XtraDB-Cluster-galera-debuginfo-2.0-1.114.rhel6.x86_64 Percona-XtraDB-Cluster-server-5.5.27-23.6.356.rhel6.x86_64 percona-xtrabackup-2.0.2-461.rhel6.x86_64 Percona-XtraDB-Cluster-devel-5.5.27-23.6.356.rhel6.x86_64 percona-testing-0.0-1.noarch raghu archie:~ [128]% sudo yum update 'Percona*' Loaded plugins: auto-update-debuginfo, fastestmirror, presto, security, upgrade-helper Loading mirror speeds from cached hostfile * base: centos.mirror.net.in * centosplus: centos.mirror.net.in * contrib: centos.mirror.net.in * elrepo: mirror.smartmedia.net.id * elrepo-extras: mirror.smartmedia.net.id * elrepo-kernel: mirror.smartmedia.net.id * epel: epel.mirror.net.in * epel-debuginfo: epel.mirror.net.in * epel-source: epel.mirror.net.in * extras: centos.mirror.net.in * fasttrack: centos.mirror.net.in * updates: centos.mirror.net.in Setting up Update Process Resolving Dependencies --> Running transaction check ---> Package Percona-Server-shared-compat.x86_64 0:5.5.27-rel28.1.296.rhel6 will be updated ---> Package Percona-Server-shared-compat.x86_64 0:5.5.34-rel32.0.591.rhel6 will be an update ---> Package Percona-XtraDB-Cluster-client.x86_64 1:5.5.27-23.6.356.rhel6 will be obsoleted ---> Package Percona-XtraDB-Cluster-client-55.x86_64 1:5.5.34-25.9.606.rhel6 will be obsoleting ---> Package Percona-XtraDB-Cluster-debuginfo.x86_64 1:5.5.27-23.6.356.rhel6 will be updated ---> Package Percona-XtraDB-Cluster-debuginfo.x86_64 1:5.5.34-25.9.584.rhel6 will be an update ---> Package Percona-XtraDB-Cluster-devel.x86_64 1:5.5.27-23.6.356.rhel6 will be obsoleted ---> Package Percona-XtraDB-Cluster-devel-55.x86_64 1:5.5.34-25.9.606.rhel6 will be obsoleting ---> Package Percona-XtraDB-Cluster-galera.x86_64 0:2.0-1.114.rhel6 will be obsoleted ---> Package Percona-XtraDB-Cluster-galera-2.x86_64 0:2.8-1.157.rhel6 will be obsoleting ---> Package Percona-XtraDB-Cluster-galera-debuginfo.x86_64 0:2.0-1.114.rhel6 will be updated ---> Package Percona-XtraDB-Cluster-galera-debuginfo.x86_64 0:2.8-1.165.rhel6 will be an update ---> Package Percona-XtraDB-Cluster-server.x86_64 1:5.5.27-23.6.356.rhel6 will be obsoleted ---> Package Percona-XtraDB-Cluster-server-55.x86_64 1:5.5.34-25.9.606.rhel6 will be obsoleting --> Processing Dependency: percona-xtrabackup >= 2.1.4 for package: 1:Percona-XtraDB-Cluster-server-55-5.5.34-25.9.606.rhel6.x86_64 --> Processing Dependency: socat for package: 1:Percona-XtraDB-Cluster-server-55-5.5.34-25.9.606.rhel6.x86_64 ---> Package Percona-XtraDB-Cluster-shared.x86_64 1:5.5.27-23.6.356.rhel6 will be obsoleted ---> Package Percona-XtraDB-Cluster-shared-55.x86_64 1:5.5.34-25.9.606.rhel6 will be obsoleting ---> Package Percona-XtraDB-Cluster-test.x86_64 1:5.5.27-23.6.356.rhel6 will be obsoleted ---> Package Percona-XtraDB-Cluster-test-55.x86_64 1:5.5.34-25.9.606.rhel6 will be obsoleting --> Running transaction check ---> Package percona-xtrabackup.x86_64 0:2.0.2-461.rhel6 will be updated ---> Package percona-xtrabackup.x86_64 0:2.1.6-702.rhel6 will be an update ---> Package socat.x86_64 0:1.7.2.2-1.el6 will be installed --> Processing Dependency: libreadline.so.5()(64bit) for package: socat-1.7.2.2-1.el6.x86_64 --> Running transaction check ---> Package compat-readline5.x86_64 0:5.2-17.1.el6 will be installed --> Finished Dependency Resolution Dependencies Resolved ===================================================================================================================================================================================================================== Package Arch Version Repository Size ===================================================================================================================================================================================================================== Installing: Percona-XtraDB-Cluster-client-55 x86_64 1:5.5.34-25.9.606.rhel6 percona-testing 6.3 M replacing Percona-XtraDB-Cluster-client.x86_64 1:5.5.27-23.6.356.rhel6 Percona-XtraDB-Cluster-devel-55 x86_64 1:5.5.34-25.9.606.rhel6 percona-testing 2.8 M replacing Percona-XtraDB-Cluster-devel.x86_64 1:5.5.27-23.6.356.rhel6 Percona-XtraDB-Cluster-galera-2 x86_64 2.8-1.157.rhel6 percona-testing 1.1 M replacing Percona-XtraDB-Cluster-galera.x86_64 2.0-1.114.rhel6 Percona-XtraDB-Cluster-server-55 x86_64 1:5.5.34-25.9.606.rhel6 percona-testing 15 M replacing Percona-XtraDB-Cluster-server.x86_64 1:5.5.27-23.6.356.rhel6 Percona-XtraDB-Cluster-shared-55 x86_64 1:5.5.34-25.9.606.rhel6 percona-testing 645 k replacing Percona-XtraDB-Cluster-shared.x86_64 1:5.5.27-23.6.356.rhel6 Percona-XtraDB-Cluster-test-55 x86_64 1:5.5.34-25.9.606.rhel6 percona-testing 7.1 M replacing Percona-XtraDB-Cluster-test.x86_64 1:5.5.27-23.6.356.rhel6 Updating: Percona-Server-shared-compat x86_64 5.5.34-rel32.0.591.rhel6 percona 3.4 M Percona-XtraDB-Cluster-debuginfo x86_64 1:5.5.34-25.9.584.rhel6 percona-testing 36 M Percona-XtraDB-Cluster-galera-debuginfo x86_64 2.8-1.165.rhel6 percona-testing 7.5 M Installing for dependencies: compat-readline5 x86_64 5.2-17.1.el6 base 130 k socat x86_64 1.7.2.2-1.el6 epel 245 k Updating for dependencies: percona-xtrabackup x86_64 2.1.6-702.rhel6 percona 6.8 M Transaction Summary ===================================================================================================================================================================================================================== Install 8 Package(s) Upgrade 4 Package(s) Total download size: 87 M Is this ok [y/N]: n Exiting on user Command