Is it possible to migrate databases from old 32-bit MySQL server to a newer 64-bit based one?
Yes, it is possible to migrate MySQL databases to CentOS 6.x (x64). To do that, please prepare a new MySQL server according to the requirements of the Installing MySQL 5 deployment guide. Server should have same IP addresses as original MySQL server. Do not register this server in OA, just install OS and necessary RPM packages according to the guide .