Your primary SCSI controller is an Adaptec AIC-7890/1 Ultra2 SCSI host adapter; your secondary (with the CD) is an Adaptec AIC-7860 Ultra SCSI host adapter (according to one of my PowerEdge 2300s running Debian 2.1).
You need to search the mailing list archives for the aic7xxx SCSI driver and its conflict with the wd7000 driver and special command-line flags - people have produced special boot disks that work for machines with AIC7890s, as this is an ongoing problem. Ian Redfern ([EMAIL PROTECTED])