Thank you for your reply!
Due to my OraDB Database need exactly 5.5 (with more internal reasons I could not share here)
$ uname -r
$ uname -a
Linux cloudsme 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:39 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.5 (Tikanga)
and I must find it, install on new server and migration the database through.
Yes, of course, CentOS 5.5 is wellcome.