Dell seem slow to support native Netware on new hardware (is this the beginning of the end?), but I solved a similar problem with a PE2950 whose POST showed PERC copyright info from LSI Logic Inc.: LSI's website had a Netware driver that worked. Our PE SC1420 is Windows, but POST shows Perc 320/DC with an Adaptec copyright, so I would try Adaptec's website.
Good luck!