"Seth" my problem is that the old harddisks will be removed. After that the new controller will be installed and the new SATA Disks will be insert and a new array will be created. After that the Centos will be copied from the old disk to the new. And after that the system should running. So i think i need only to install additional the 3w-9xxx driver in the kernel. And if the server rebbot new with the new controller he should use the 9xxx driver. At this time is an old 7000-2 controller in the server and a 3w-xxxx is at this time loaded. Is it possible to load 3w-xxxx and 3w-9xxx at the same time in the kernel or can that be a risk? I hope my english was not so bad :-) and thanks for your help. Sven