Owner's Manual

16 Installation Instructions and Important Information
NOTE: You can download the ipmi driver from support.dell.com.
Red Hat Enterprise Linux 4 Might Fail to Detect NUMA Nodes
On PowerEdge systems that support Non-Uniform Memory Access (NUMA)
with the node interleaving disabled in the BIOS, Red Hat Enterprise
Linux 4 Update 7 and later may fail to recognize the NUMA nodes and display
only node 0.
To fix this issue, add the following parameter to the kernel command line
when the system boots:
numa=acpi
C3 Power State is Not Supported on Red Hat Enterprise Linux 4
Processors capable of entering into a sleep state (C3) when idle, can improve
the system's power efficiency during periods of decreased activity. Support has
been added to the kernel for the C3 power state on the processor series
mentioned below, beginning with Red Hat Enterprise Linux 5 update 3.
• Intel Xeon X55xx
• Intel Xeon E55xx
• Intel Xeon L55xx
Red Hat Enterprise Linux 4 does not support the C3 power state.
Ispci Command Reports Unknown Devices
When you use the lspci command to display information about all the
Peripheral Component Interconnect (PCI) buses in the system and all the
devices connected to them, the output may contain a few unknown devices.
The issue occurs when the pci.ids file does not contain the definition of the
latest chipsets, hardware, and so on, of the system.
To resolve the issue, use one of the following methods:
• Download the latest pci.ids file from pciids.sourceforge.net/pci.ids and
save it at
/usr/share/pci.ids .
•Use the update-pciids utility to download the latest pci.ids file.
RHELIIG.book Page 16 Thursday, April 14, 2011 12:15 PM