Sun x4500 and firmware

I ran across a number of issues with 10u6 and the x4500 ( Thumper ) especially with their Marvell drivers. In particular you have to make sure you are running the latest and greatest firmware and have all of the latest kernel and driver patches. When you install the latest firmware Sun recommends doing a clean install of Solaris so that the disks get numbered correctly. What you will find is that c3's can become c5's and c5's can become c3's. It only happens on the "boot drives" in the x4500's. I did a Live Upgrade flar install with the new firmware and Solaris figured out the drive ordering with no problems.