Users Guide

Information Update 5
Failure to Load usb-ohci Driver Message on Systems Running
Red Hat Enterprise Linux (Version 2.1)
A failure message may be displayed when Initializing USB controller (usb-ohci)
appears during startup. Update versions of Red Hat Enterprise Linux (version 2.1) prior to
Update 4 mistakenly attempt to load this driver for the USB 2.0 controller. Red Hat Enterprise
Linux (version 2.1) does not support USB 2.0. To avoid this erroneous message on versions prior
to Update 4, remove the line in
/etc/modules.conf that causes usb-ohci to load. Otherwise, install
Red Hat Enterprise Linux (version 2.1) Update 4 to resolve the problem.
NIC Teaming Limitations
If you configure the baseboard management controller (BMC) to access the system using the first
integrated NIC (NIC1), teaming functionality and BMC functionality will be affected in certain
situations, as shown in Table 1-1.
Table 1-1. Effect of BMC Use of NIC1 on Teaming Functionality
AFT, ALB/RLB, and SFT
Teaming Mode
IEEE 802.3ad and Ether Channel
Teaming Mode
Action Effect Effect
NIC1 allocated to BMC
before team is created
Normal teaming and BMC
functionality.
BMC and NIC1 will issue a
warning message about the loss of
management traffic in the event
of adaptive failover.
Normal teaming functionality.
BMC functionality may be
affected because of loss of
management traffic.
BMC and NIC1 will issue a
warning message about loss of
management traffic in the event
of adaptive failover.
NIC1 allocated to BMC
after team is created
Normal teaming and BMC
functionality.
BMC will issue a warning message
about the loss of management
traffic in the event of adaptive
failover.
NIC1 will not display a warning
message but teaming will function
normally.
Normal teaming functionality.
BMC functionality may be
affected because of loss of
management traffic.
BMC will issue a warning message
about loss of management traffic
in the event of adaptive failover.
NIC1 will not display a warning
message but teaming will function
normally.
NIC1 BMC access disabled
before team is created
Normal teaming functionality Normal teaming functionality