HP LC2000r HP Netserver LC 2000 Installation Guide - Page 71
IRQ Settings, System Board PCI Slots
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Chapter 6 Installing Additional Boards IRQ Settings The IRQ settings are automatically assigned and don't require user intervention. PCI boards have the capability of sharing hardware interrupts (IRQs) with other PCI boards, as stated in the PCI specifications, but this does not always prove to be true between board manufacturers. To solve this problem requires an in-depth knowledge of a server's implementation to place a PCI board in a slot that would not conflict with another PCI board's IRQ setting. The HP NetServer provides various ways to automatically share interrupts in the NetServer. The sharing mode can be selected under the heading "Sharing Algorithms" in the Setup Utility. The IRQs are automatically assigned during boot up for each PCI slot and embedded device in the NetServer, avoiding any IRQ conflicts and providing the best performance. This feature also provides a way of manually assigning IRQs when disabling the Sharing Algorithm feature. Refer to Chapter 10, "Configuring the HP NetServer," for more information. These IRQ assignments trigger the installed NOS to enable the APIC (Advanced Programmable Interrupt Controller) which takes control of the IRQ sharing scheme. You are not required to manually assign interrupts for the following NOSs: l Microsoft's NT 4.0 l Novell's NetWare 5 l SCO UnixWare 7 NOTE SCO UnixWare 7 requires installation of the OSMP module to enable the APIC mode. System Board PCI Slots All accessory boards plug into the six slots on system board at the rear of the NetServer's chassis. See Figure 6-1. • Four PCI slots (P1-P4) support full length 32-bit boards at a clock rate of 33 MHz. These slots only support +5 VDC power and Universal boards. These slots have keys in the upper half of the board slot to prevent 3.3 volt boards from being inserted into the slots. NOTE Universal boards automatically switch to accept power from a +5.0 or +3.3 VDC source and have a key slot in the connector to allow installation in any of the 6 PCI slots. 63