yahhhh! i too finally got my proliant 5500 with SMARTII RAID controller to work, but i installed from debian floppies. my method using potato (also did it with slink) boot floppies.
1.download kernel source and compile a new kernel with SNARTII compiled in 2.cp the kernel into /floppy/linux 3.edit the rdev.sh to rdev /floppy rather than /mnt/floppy 4.boot the modified installer on the RAID machine 5.cp the mkdev.ida script (in kernel source) to a floppy and modify it to not to use the eval command 6.jump into a shell, mount the floppy, run mkdev.ida 1 5 2 (you have to make as few devices as possible because of the inode shortage) 7.mke2fs on c0dX (where X is the "logical disk" created in the smart start) 8.fdisk the disks to create 1 partiton per 9.mke2fs on each partition (if you know a better way to do this give me a shout, but this was all that ic oudl come up with) 10.mount root (/dev/ida/c0d0p1) on /target; mkswap /dev/ida/c0d1p1; mkdir /target/usr; mount usr (/dev/ida/c0d2p1) on /target/usr keep mounting the other partitions in this way 11.go to the installer and start installing. (DO NOT REBOOT) 12.back to the other computer where we compiled our kernel. pop another floppy into the drive and make bzdisk. 13.modify the mkdev.ida script to install devices on /target/dev/ida rather than /dev/ida. 13.back to the RAID machine. mount the new floppy with the new script 14.mkdev.ida 15.eject that floppy and pop in the one with the new kernel on it. and rdev /dev/fd0 /dev/ida/c0d0p1 16.unmount and reboot. 17.install the base on the system, make sure your install kernel source and rpm. 18.download from the red hat site the lilo rpm 19.rpm --force --nodeps -ivh lilo-0.21-10.i386.rpm 20.eject the floppy that you used to boot and reboot the machine. With a little luck, and a properly configured kernel it should work. this took me a while to figure out, but did i learn a lot. Most of the info i got was from www.linuxdoc.org what a great site. then there is always the trusty man pages. i hope this helps anybody else who has been having touble with a raid boot. evan