mysql service Not starting ( Percona xtradb cluster configured )

hi all,

we are using percona xtradb cluster on centos ,
we are configured 4 nodes now 2nd and 3rd node is stopped.
i’m not able to restart the mysql service. while start the mysql service facing the following error message.

#service mysql status
ERROR! MySQL (Percona XtraDB Cluster) is not running, but lock file (/var/lock/subsys/mysql) exists

#service mysql start
ERROR! MySQL (Percona XtraDB Cluster) is not running, but lock file (/var/lock/subsys/mysql) exists
Starting MySQL (Percona XtraDB Cluster)…State transfer in progress, setting sleep higher
… … ERROR! The server quit without updating PID file (/var/lib/mysql/p2.hostroyale.com.pid).
ERROR! MySQL (Percona XtraDB Cluster) server startup failed!

i’m already cleared lock and log files please anybody help me…

thanks

ramesh