I have finally managed to grab some time to add to this thread. I have gotten the SME Server 6.01 to load AND restart on a Dell PE420SC with dual SATA drives. The problem reported earlier was with the standard 6.01 mkinitrd. I upgraded it to version 4.2.9-1 (mkinitrd-4.2.9-1sn.i386.rpm), and it successfully creates the initrd with sata modules included.
In order for the installation to see the SATA drives to begin with, I had to use the 7.0Alpha boot code, and replace the standard (6.01-01) boot directories on the ISO CD. I also base my SME installations on AjKeanes 6.01-01-custom.iso. I have placed a modified version of this custom ISO in my contribs area (
http://mirror.contribs.org/smeserver/contribs/ckearns/), for anyone who is interested. The iso is called smeserver-6.01-01custom-sn.iso
The only differences in terms of rpms between my -sn.iso and the AjKeanes custom iso is the kernel (2.4.20-31.9 versus 2.4.20-18.7) and mkinitrd (4.2.9-1 versus 3.3.10-1). I have only added the i686 kernels, as I have only tested on PE420Scs. I will place the src RPM there when I get a chance.
This ISO has been in production on a number of customer sites since early March, and is very stable.