Compaq 108164-003 - ProLiant - 800 Integration Notes page 43

PCI Bus Numbering in a Microsoft Windows NT Environment
Appendix B, PCI Test Configurations with
Retired ProLiant Servers
The following scenarios were tested in the Compaq Integration Lab. The scenarios demonstrate
how the PCI BIOS assigns the bus numbers and then reassigns the bus numbers based on
configuration modifications. The following examples demonstrate the step-by-step changes that
occur:
Configuration A: Test 1 – Initial Configuration and Test 2 – Adding a Device.
Configuration B: Test 1 – Initial Configuration and Test 2 – Addition of Two Controllers.
By understanding what configuration changes occur in the test scenarios described in this section,
you can better understand how PCI Bus numbers are reassigned when configuration changes
occur in your server. "Table 17. PCI Bus Number Order of Detection Matrix", included in
Appendix D, identifies the Controller Discovery Order for each of these servers and several
others.
Configuration A, ProLiant 6500 server (dual-peer architecture), a two configuration scenario:
The PCI slot layout is different than the ProLiant 5000, ProLiant 6000 and ProLiant 7000 servers.
This scenario walks through a simple Windows NT configuration and shows how the bus
numbers change when you add a new controller to the server. The configurations are illustrated in
two tables with a side bar description of what the PCI BIOS does during the discovery process.
Configuration B, ProLiant 6000 and 7000 servers (dual-peer architecture), a more complex
two configuration scenario tested on both the ProLiant 6000 and ProLiant 7000 servers: The
results were identical for both these servers. The servers were modified to include additional disk
and network controllers. The configurations are illustrated in two tables with a side bar
description of what the PCI BIOS does during the discovery process.
The ProLiant 5000 server was tested with similar configuration scenarios, but the results are not
included in this white paper. The most notable difference about this server is the PCI slot layout
and PCI bus number detection order is different from each of the above mentioned servers. The
PCI slots in the ProLiant 5000 are identified in a different device number-ordering scheme. The
first slot to be discovered on the Primary Bus by the PCI BIOS is slot 5 bus 0, followed by slots
8, 7, 6, 4, 3 and finally 2. The test results for bus numbering assignments occurred in the same
manner as it did in the other servers tested.
IMPORTANT: Be aware that the bus number detection process in the ProLiant 5000 server is
not in sequential slot number order. Keeping that in mind, all other numbering considerations
follow the results described in Configuration A.
Configuration A, ProLiant 6500
All the controllers included in this configuration were installed in the server before Windows NT
was loaded on the system. Windows NT detected network controllers in the original configuration
during the installation process. However, when the configuration is modified in Test 2 PCI bus
renumbering does occur.
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