[CentOS] Controller detection order

Hi,

I have a dell poweredge 850 with centos 4, freshly installed. I'm now trying to add in a fibre -> sata raid enclosure with LSI HBA's in the 850.

My problem is the enclosure gets detected first, hijacking sda and sdb from the internal SATA drive and causing kernel panic at boot time. I've tried changing the order in modprobe to the following:

alias eth0 tg3 alias eth1 tg3 alias eth2 e1000 alias eth3 e1000 alias scsi_hostadapter ata_piix alias scsi_hostadapter1 mptbase alias scsi_hostadapter2 mptscsih alias usb-controller ehci-hcd alias usb-controller1 uhci-hcd

previously ata_piix was below the other two.

This hasn't made any difference though. Can anyone suggest any solutions?

thanks

Nick