Owner's Manual

24 Installation Instructions and Important Information
Number of USB Devices are Restricted to 8 on Certain AMD Processor-Based
Systems
The ehci-hcd driver in Red Hat Enterprise Linux 4 Update 4 can only handle
a limited number of USB devices with interrupt pipes. Only 8 USB devices
can be connected to the system at one time. Some USB devices may stop
working if more than 8 are attached to the system.
A fix for this issue is available in Red Hat Enterprise Linux 4 Update 7.
System May Not Respond After the Installation of Software RAID 1 After Initial
Reboot
If data exists in the master boot record (MBR) at installation time, then the
GRUB loader is not installed and you cannot boot the system. The
workaround for this issue is to overwrite the MBR with zeros:
dd if=/dev/zero of=/dev/<disk_name> bs=512 count=1
where <disk_name> is the device name given by the Linux kernel for the
hard drive where the MBR is installed.
A fix for this issue is available in Red Hat Enterprise Linux 4 Update 7.
System May Lock Up While Initializing X Window System
On certain systems, the process of initializing the X Window system may
sometimes cause a system lockup.
A fix for this issue is available in Red Hat Enterprise Linux 4 Update 7.
Using IDE Tape Drives
CAUTION: Using /dev/st0 devices rewinds the tape after every dump is made and
erases the existing data on the next dump. If you want to archive the data, use
/dev/nst0 devices and use the mt -f /dev/nst0 [option] command to move between
archives.
If your system uses the GRUB loader, add the following text to each line that
begins with kernel in the /boot/grub/grub.conf file to ensure that your IDE
drive is accessing the correct driver for an IDE tape drive:
/dev/ht0=ide-scsi
The following example file segment highlights the changed line:
title Red Hat Enterprise Linux (2.6.9-x.EL)
RHELIIG.book Page 24 Thursday, April 14, 2011 12:15 PM