The installation works using the 5.5.31 RPMs even though some junk is left in the /var/lib/msyql directory

# yum -y install Percona-Server-{server,client,devel,shared}-55*
Loaded plugins: downloadonly, fastestmirror, replace
Loading mirror speeds from cached hostfile
 * base: mirror.solarvps.com
 * epel: mirror.us.leaseweb.net
 * extras: mirror.ash.fastserv.com
 * ius: mirror.symnds.com
 * updates: mirror.atlanticmetro.net
Setting up Install Process
Examining Percona-Server-server-55-5.5.31-rel30.3.520.rhel6.x86_64.rpm: Percona-Server-server-55-5.5.31-rel30.3.520.rhel6.x86_64
Marking Percona-Server-server-55-5.5.31-rel30.3.520.rhel6.x86_64.rpm to be installed
Examining Percona-Server-client-55-5.5.31-rel30.3.520.rhel6.x86_64.rpm: Percona-Server-client-55-5.5.31-rel30.3.520.rhel6.x86_64
Marking Percona-Server-client-55-5.5.31-rel30.3.520.rhel6.x86_64.rpm to be installed
Examining Percona-Server-devel-55-5.5.31-rel30.3.520.rhel6.x86_64.rpm: Percona-Server-devel-55-5.5.31-rel30.3.520.rhel6.x86_64
Marking Percona-Server-devel-55-5.5.31-rel30.3.520.rhel6.x86_64.rpm to be installed
Examining Percona-Server-shared-55-5.5.31-rel30.3.520.rhel6.x86_64.rpm: Percona-Server-shared-55-5.5.31-rel30.3.520.rhel6.x86_64
Marking Percona-Server-shared-55-5.5.31-rel30.3.520.rhel6.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package Percona-Server-client-55.x86_64 0:5.5.31-rel30.3.520.rhel6 will be installed
---> Package Percona-Server-devel-55.x86_64 0:5.5.31-rel30.3.520.rhel6 will be installed
---> Package Percona-Server-server-55.x86_64 0:5.5.31-rel30.3.520.rhel6 will be installed
---> Package Percona-Server-shared-55.x86_64 0:5.5.31-rel30.3.520.rhel6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================
 Package
      Arch   Version                  Repository                                                 Size
======================================================================================================
Installing:
 Percona-Server-client-55
      x86_64 5.5.31-rel30.3.520.rhel6 /Percona-Server-client-55-5.5.31-rel30.3.520.rhel6.x86_64  29 M
 Percona-Server-devel-55
      x86_64 5.5.31-rel30.3.520.rhel6 /Percona-Server-devel-55-5.5.31-rel30.3.520.rhel6.x86_64  7.3 M
 Percona-Server-server-55
      x86_64 5.5.31-rel30.3.520.rhel6 /Percona-Server-server-55-5.5.31-rel30.3.520.rhel6.x86_64  64 M
 Percona-Server-shared-55
      x86_64 5.5.31-rel30.3.520.rhel6 /Percona-Server-shared-55-5.5.31-rel30.3.520.rhel6.x86_64 3.0 M

Transaction Summary
======================================================================================================
Install       4 Package(s)

Total size: 104 M
Installed size: 104 M
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : Percona-Server-shared-55-5.5.31-rel30.3.520.rhel6.x86_64                           1/4 
  Installing : Percona-Server-client-55-5.5.31-rel30.3.520.rhel6.x86_64                           2/4 
  Installing : Percona-Server-server-55-5.5.31-rel30.3.520.rhel6.x86_64                           3/4 
ls: cannot access /var/lib/mysql/*.err: No such file or directory
ls: cannot access /var/lib/mysql/*.err: No such file or directory

PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:

/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h monty-testwellesley password 'new-password'

Alternatively you can run:
/usr/bin/mysql_secure_installation

which will also give you the option of removing the test
databases and anonymous user created by default.  This is
strongly recommended for production servers.

See the manual for more instructions.

Please report any problems with the /usr/scripts/mysqlbug script!

Percona recommends that all production deployments be protected with a support
contract (http://www.percona.com/mysql-suppport/) to ensure the highest uptime,
be eligible for hot fixes, and boost your team's productivity.
Percona Server is distributed with several useful UDF (User Defined Function) from Maatkit.
Run the following commands to create these functions:
mysql -e "CREATE FUNCTION fnv1a_64 RETURNS INTEGER SONAME 'libfnv1a_udf.so'"
mysql -e "CREATE FUNCTION fnv_64 RETURNS INTEGER SONAME 'libfnv_udf.so'"
mysql -e "CREATE FUNCTION murmur_hash RETURNS INTEGER SONAME 'libmurmur_udf.so'"
See http://code.google.com/p/maatkit/source/browse/trunk/udf for more details
  Installing : Percona-Server-devel-55-5.5.31-rel30.3.520.rhel6.x86_64                            4/4 
  Verifying  : Percona-Server-client-55-5.5.31-rel30.3.520.rhel6.x86_64                           1/4 
  Verifying  : Percona-Server-shared-55-5.5.31-rel30.3.520.rhel6.x86_64                           2/4 
  Verifying  : Percona-Server-devel-55-5.5.31-rel30.3.520.rhel6.x86_64                            3/4 
  Verifying  : Percona-Server-server-55-5.5.31-rel30.3.520.rhel6.x86_64                           4/4 

Installed:
  Percona-Server-client-55.x86_64 0:5.5.31-rel30.3.520.rhel6                                          
  Percona-Server-devel-55.x86_64 0:5.5.31-rel30.3.520.rhel6                                           
  Percona-Server-server-55.x86_64 0:5.5.31-rel30.3.520.rhel6                                          
  Percona-Server-shared-55.x86_64 0:5.5.31-rel30.3.520.rhel6                                          

Complete!