IBM 887022X Maintenance Manual - Page 97

v The server scans devices and PCI-X slots to assign system resources in the following order: DVD-ROM drive; disk drives; integrated SCSI devices; PCI-X slots 1, 2, 3, 4, 5, 6; and the integrated Ethernet controller. If an RXE-100 enclosure is attached to the server, the scan continues in sequence with PCI slots 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18. Note: The POST/BIOS settings control the scanning order of the adapters in the PCI-X slots. However, if multiple (like) adapters from a single vendor are installed, the first installed adapter will control the ROM space for all additional like adapters that may be added at a later time. This action overrides the scan sequence set in the POST/BIOS. Some ServeRAID adapters have this impact on the scan sequence. v You can use the Configuration/Setup Utility program to change the sequence and have the server scan one of the first six PCI slots before it scans the integrated devices. You cannot change the scan sequence of the PCI slots in an RXE-100 enclosure. v You can install both PCI and PCI-X adapters in the same bus. However, if you install a PCI adapter and a PCI-X adapter in the same bus, the PCI-X features of the PCI-X adapter will be disabled and the adapter will function as a PCI adapter. v You can install PCI or PCI-X adapters of speeds faster than what is labeled for a particular PCI-X bus. For example, if you install two 133 MHz adapters into slots that are labeled as 100 MHz slots, the adapters will operate at 100 MHz. v If you install a 33 MHz and a 66 MHz adapter in the same bus, the bus speed will match that of the slowest adapter. v If a single 133 MHz adapter is installed in PCI-X Bus B (slot 3 and 4), and the other slot in PCI-X Bus B is empty, the adapter will operate at 133 MHz. v The server supports six hot-plug 64-bit adapters in the expansion slots located on the PCI-X board. Note: You can add up to 12 PCI-X slots to the server by connecting the server to a remote I/O expansion enclosure. For more information about the expansion enclosure and how to connect the server to it, see the documentation that comes with your expansion enclosure. Bus Slot Supported adapter speed (MHz) A 1 66 A 2 66 B 3 100 (133 if slot 4 is empty) B 4 100 (133 if slot 3 is empty) C 5 133 D 6 133 v The server supports 3.3 V adapters; it does not support 5.0 V adapters. v Do not install a PCI-X adapter in PCI-X slot 1 if you are going to install the serial port that comes with the server. See "Installing the serial port" on page 91 for instruction for installing the serial port. Chapter 4. Installing options 87