Installation guide

this command gives you the option of testing the integrity of the install source (if an ISO-
based method). this command works with the CD, DVD, hard drive ISO, and NFS ISO
installation methods. Verifying that the ISO images are intact before you attempt an
installation helps to avoid problems that are often encountered during an installation.
mem=xxxm
this command allows you to override the amount of memory the kernel detects for the
machine. This may be needed for some older systems where only 16 mb is detected and for
some new machines where the video card shares the video memory with the main memory.
When executing this command, xxx should be replaced with the amount of memory in
megabytes.
mpath
enables multipath support.
Important — mandatory for installation on multipath
devices
If you install Red Hat Enterprise Linux 5.11 on a network storage device accessible
through multiple paths, you must boot the installation process with this option. If you
do not specify this option at boot time, installation will fail, or the system will fail to
boot after installation completes.
nmi_watchdog=1
this command enables the built-in kernel deadlock detector. This command can be used to
debug hard kernel lockups. by executing periodic NMI (Non Maskable Interrupt) interrupts,
the kernel can monitor whether any CPU has locked up and print out debugging messages
as needed.
noapic
this x86 boot command tells the kernel not to use the APIC chip. It may be helpful for some
motherboards with a bad APIC (such as the Abit BP6) or with a buggy bios. systems based
on the nvidia nforce3 chipset (such as the Asus SK8N) have been known to hang during
IDE detection at boot time, or display other interrupt-delivery issues.
noeject
do not eject optical discs after installation. This option is useful in remote installations
where it is difficult to close the tray afterwards.
nomce
this x86 boot command disables self-diagnosis checks performed on the CPU. the kernel
enables self-diagnosis on the CPU by default (called machine check exception). Early
Compaq Pentium systems may need this option as they do not support processor error
checking correctly. A few other laptops, notably those using the Radeon IGP chipset, may
also need this option.
nonet
this command disables network hardware probing.
Red Hat Ent erprise Linux 5 Inst allat ion G uide
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