Advanced Boot Loader Configuration

Now that you have chosen which boot loader to install, you can also determine
where you want the boot loader to be installed. You may install the boot loader
in one of two places:

The master boot record (MBR)
This is the recommended place to install a boot loader, unless the MBR already
starts another operating system loader, such as System Commander. The MBR is
a special area on your hard drive that is automatically loaded by your computer's
BIOS, and is the earliest point at which the boot loader can take control of the
boot process. In case if you install it in the MBR, when your machine boots,
GRUB presents a boot prompt. You can then boot Red Hat Enterprise Linux or
any other operating system that you have configured the boot loader to boot.

The first sector of your boot partition
This is recommended if you are already using another boot loader on your
system. In this case, your other boot loader takes control first. You can then
configure that boot loader to start GRUB, which then boots Red Hat Enterprise
Linux.

Tip

If you have a RAID card, be aware that some BIOSes do not support booting from the
RAID card. In cases such as these, the boot loader should not be installed on the MBR
of the RAID array. Rather, the boot loader should be installed on the MBR of the same
drive as the /boot/ partition was created.

If your system only uses Red Hat Enterprise Linux, you should choose the MBR.
Click the Change Drive Order button if you would like to rearrange the drive
order or if your BIOS does not return the correct drive order. Changing the drive
order may be useful if you have multiple SCSI adapters, or both SCSI and IDE
adapters, and you want to boot from the SCSI device.

The Force LBA32 (not normally required) option allows you to exceed the 1024
cylinder limit for the /boot/ partition. If you have a system which supports the
LBA32 extension for booting operating systems above the 1024 cylinder limit,
and you want to place your /boot/ partition above cylinder 1024, you should
select this option.

Tip

While partitioning your hard drive, keep in mind that the BIOS in some older systems
cannot access more than the first 1024 cylinders on a hard drive. If this is the case,

Leave enough room for the /boot Linux partition on the first 1024 cylinders of your
hard drive to boot Linux. The other Linux partitions can be after cylinder 1024.

In parted, 1024 cylinders equals 528MB. For more information, refer to:
http://www.pcguide.com/ref/hdd/bios/size MB504-c.html. To add default options
to the boot command, enter them into the Kernel parameters field. Any options

you enter are passed to the Linux kernel every time it boots.

2.15.2. Rescue Mode
Rescue mode provides the ability to boot a small Red Hat Enterprise Linux
environment entirely from boot media or some other boot method instead of the
system's hard drive. There may be times when you are unable to get Red Hat
Enterprise Linux running completely enough to access files on your system's
hard drive. Using rescue mode, you can access the files stored on your system's
hard drive, even if you cannot actually run Red Hat Enterprise Linux from that
hard drive. If you need to use rescue mode, try the following method:
Use the CD-ROM to boot an x86, AMD64, or Intel® 64 system, type
linux rescue at the installation boot prompt. Itanium users should type
elilo linux rescue to enter rescue mode.

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