as a follow up..
the raid.s kernal seems to be the answer for slack 9.1 on the x335 (and I expect other xSeries machines as well).
I used the ISO images to make my install cd's, booted with the raid.s, used cfdisk to make my partitions, and did a full install (including kde/gnome on second disk). Everything seemed to install fine.
This was an IBM x335, 2 xeon 2.0ghz processors, 1gb ram, 1 Ultra320 36gb drive.
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