Interrupt Sharing - HP D6030A - NetServer - E50 Installation Manual

Chapter 6
5. PCI slot 1
6. PCI slot 2
7. PCI slot 3
8. PCI slot 4
9. ISA slot
The NetServer scans for a boot device on SCSI Channel A starting at device ID 0
and works up through the ID numbers (0-15). The SCSI controller board is always
set at SCSI ID 7. If an optional SCSI tape drive is installed, set it at SCSI address
ID 4.
NOTE The boot order can be changed using the HP NetServer's
(BIOS) Setup Utility (press [Del] during the boot process) and
the SCSI Select Utility.

Interrupt Sharing

The HP NetServer provides IRQ sharing, since the number of IRQs are limited.
This means two devices (for example, two PCI slots) may share the same
interrupt. Using this scheme the NetServer is capable of supporting more
accessory devices and avoiding internal conflicts. However, interrupt-sharing
results in a small performance loss as the operating system has to resolve which of
the devices caused the interrupt before it responds.
NOTE
HP does not support the USB ports and by changing the USB
Function from [Enabled] to [Disabled] you can free up another
IRQ. If your are not using one or both of the two serial ports
and the single parallel port, you can also disable these ports to
free up more IRQs.
IRQ sharing is automatically assigned for the PCI slots in the HP NetServer. The
single ISA bus expansion slot gets the first IRQ assignment followed by the four
PCI slots, followed by the AGP slot and USB port respectively.
If you are installing a PCI board that does not support interrupt sharing, refer to
the accessory board documentation and make the specified changes in the Setup
Utility to support the accessory board. If your are installing a non-Plug and Play
ISA board, refer to the procedure in Chapter 8, "Configuring the HP NetServer,"
for the resource assignments of the non-Plug and Play ISA board.
Installing Additional Boards
37