Almost two months after RHEL5.4, Centos 5.4 was released on the 21st October. This version includes various changes into the virtualization field and it includes support for KVM (kernel-based virtual machine) hypervisor and the Xen hypervisor.
Also this release features many bug fixes and security updates, and should be an easy upgrade for users running centos5.x:
yum update
For the full list of packages changed/added please see the centos5.4 release notes: http://wiki.centos.org/Manuals/ReleaseNotes/CentOS5.4

Is there a problems again with the SATA disks? In my desktop pc a had a that problem.
We haven’t seen such problems. How did you solved the issue? kernel? upgrade/downgrade?
Firstly my sata disk was not recognised, but when I used the boot option irqpoll nolvm2 it’s appear, but when the installation finished it’s print an error and not booted. When I turned off the sata – centos loaded.
Yum upgrade from CentOS 5.2 to 5.4 has broken Cacti 0.8.7e severely. Even after applying cacti patches at http://www.cacti.net/download_patches.php httpd still records “(13)Permission denied:” with no remedy in sight.
Since Cacti is not packedin Centos I will assume you installed this by hand or used some external third party packages. There can be various reasons why this could happen, but I would take a guess that this is related to SELinux. Make sure that your web server has the proper permissions (if unsure, just disable it and see if it helps, and then get back and fix the permissions). hth.
I have faced the same issue of accessing the site and getting a warning message instead of the original page. Most probably the issue will be with iframe . In my case also there were iframe entries but they were valid entries.