[CentOS] problem installing centos 5.3 on IBM x3200 m2

Hi, I am trying to install centos 5.3 on ibm x3200 m2 server. The problem appears when the installer is about to finish the installation. It detects the RAID correctly, but it doesn't finish formatting the root partition. I tried the default partition layout and also a custom one, but it always ends with the same message: An error occurred trying to format /. this problem is serious and the install cannot continue.

I also checked the error console (ctrl+alt+F4) and it writes: <3> sd 0:1:10:0: rejecting I/O to offline device

lspci says that the machin has an: LSI Logic SAS1064ET PCI-Express SCSI controller Broadcom NetXtreme BCM5722 Ethernet

Has anybody an idea, how to fix this?

BR