2-10Adaptec RAID Installation Guidecontroller, you may need to move another controller in yoursystem to accommodate this requirement.4 SCSI only—Connect any external cables to the controller.Note: If you have disk drives attached to a SCSI controllerwith a Symbios chipset, use SMOR to set the BootableDevices option to Disable.determining the booting controllerAdaptec RAID controllers are shipped with a controller BIOSROM enabled for PCI assignment. This BIOS intercepts andprocesses Int13 BIOS calls with an embedded DOS driver.The controller BIOS ROM can be disabled or the address changedautomatically by the system’s Plug-and-Play BIOS. In systemswith multiple Adaptec controllers, the first Adaptec RAIDcontroller found during boot loads its BIOS and installs all of theother Adaptec controllers. Any additional Adaptec RAIDcontrollers that are found automatically detect the presence ofthe first controller and disable their BIOS. The disk controllerthat has the lowest BIOS ROM address (typically, the lowest PCIslot number) will become the booting controller.Ensure that the Adaptec ROM occupies the lowest address if youwant the Adaptec controller to be the booting controller in asystem with controllers from multiple manufacturers.Some system BIOS manufacturers select the smallest add-inBIOS as the first candidate, therefore slot selection has no effecton which adapter BIOS loads first. In this case, you need todisable the BIOS on selected adapters to control which adapter isthe boot controller. This procedure can also be helpful insituations where it is physically difficult to manage the slot order.controller IRQ and addressDuring the host system boot process, the system BIOS shouldautomatically configure the controller BIOS interrupt level (IRQ)and memory location for all Adaptec PCI controllers in thesystem. Refer to Appendix C for additional help.
