Does MSCS prefer one type of SCSI signaling over the other (or, differential versus single-ended)?
When not using fibre channel, MSCS works best with differential SCSI with the “Y” cables. The termination should be outside the systems so that losing power in the system does not cause the termination on the SCSI bus to be lost. Also, note that good drives in good electrical/mechanical enclosures make this work better as well.