A generous customer gave me an old Compaq 7 disk array and a single port UltraSCSI module to troubleshoot some RAID5 configurations, here are the switch options to set provided by Alex Daniels. Module: DS-BA35X-FA is a Single port, single-ended UltraSCSI personality module for BA356. Although these settings cover the single or dual port(DS-BA35X-FB) variants.   It has two sets of switches as you have observed (S3 and S4). S3 (SCSI Address switch) - When shelf bus address switches Read more...