Chapter 4 – SCSISelect Configuration Utility 4-21
4.3 Configuring Multiple SCSI Controllers
The AHA-3950U2B SCSI controller is used
as an example in the following discussion.
To use multiple PCI SCSI controllers, do the following:
• Install the boot SCSI controller in the lowest PCI Device number. The Device
number is determined by the slot number on the PCI bus.
To find out the Device number of the AHA-3950U2B SCSI controller(s), run
the SCSISelect utility (by pressing the key combination Ctrl + A when it is
displayed onscreen at bootup). Look on the first screen of SCSISelect in the
upper right hand corner for Bus:Device xx:xxh (given in hex).
If the Device number is high, move the AHA-3950U2B to a PCI slot at the
other end of the motherboard and rerun SCSISelect to see if the number is
lower.
This step is a recommended solution for most
PCI motherboards. You can also simply switch
the AHA-3950U2B SCSI controller into another
PCI slot if the boot order is not what is desired.
• If you are booting from the AHA-3950U2B and using ISA/EISA-based host
adapters as secondary devices, you must disable the BIOS on all ISA/EISA-
based SCSI controllers.
• If you are booting from ISA/EISA-based SCSI controllers and using the AHA-
3950U2B as a secondary device, see your ISA/EISA-based SCSI controller
documentation to ensure the SCSI controller is at the lowest BIOS base
address. ISA/EISA-based SCSI controllers which have their BIOS enabled boot
before the AHA-3950U2B.