Red Hat APPLICATION STACK 1.2 RELEASE Bedienungsanleitung PDF herunterladen (Seite 13)

Chapter 2.

Installation

This section outlines the differences between the Red Hat Enterprise Linux 6 and Red Hat Enterprise

Linux 5 installation procedures. Depending on which release of Red Hat Enterprise Linux 5 you are

migrating from, not all of the options and techniques listed here may be relevant to your environment,

as they may already be present in your Red Hat Enterprise Linux 5 environment.

2.1. Kernel and Boot Options

• You may perform memory testing before you install Red Hat Enterprise Linux by entering

memtest86 at the boot: prompt. This option runs the Memtest86 stand alone memory testing

software in place of the Anaconda system installer. Once started, Memtest86 memory testing loops

continually until the Esc key is pressed.

• The rdloaddriver kernel parameter is now needed to define the order of module loading, instead

of the old scsi_hostadapter option.

2.2. Graphical Installer

This section describes what behaviors have changed in the graphical installer.

2.2.1. Devices and Disks

• Use of the /dev/hdX device name is deprecated on the i386 and x86_64 architecture for IDE drives,

and has changed to /dev/sdX. This change does not apply to the PPC architecture.

• If you have difficulties with the installation not detecting a Smart Array card, enter linux isa at the

installer prompt. This lets you manually select the required card.

• Whereas older IDE drivers supported up to 63 partitions per device, SCSI devices are limited to 15

partitions per device. Anaconda uses the new libata driver in the same fashion as the rest of Red

Hat Enterprise Linux, so it is unable to detect more than 15 partitions on an IDE disk during the

installation or upgrade process. If you are upgrading a system with more than 15 partitions, you may

need to migrate the disk to Logical Volume Manager (LVM).

• A change in the way that the kernel handles storage devices means that device names like /dev/

hdX or /dev/sdX may differ from the values used in earlier releases. Anaconda solves this problem

by relying on partition labels. If these labels are not present, then Anaconda provides a warning that

these partitions need to be labelled. Systems that use Logical Volume Management (LVM) and the

device mapper usually do not require relabeling.

• Support is included for installation to encrypted block devices, including the root file system.

• Not all IDE RAID controllers are supported. If your RAID controller is not yet supported by mdraid,

you may combine drives into RAID arrays by configuring Linux software RAID. For supported

controllers, configure the RAID functions in the computer BIOS.

• The version of GRUB included in Red Hat Enterprise Linux 6 now supports ext4, so Anaconda now

allows you to use the ext4 file system on any partition, including the /boot and root partitions.

2.2.2. Kickstart

This section describes what behaviors have changed with related to automated installations

(Kickstart).

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Red Hat APPLICATION STACK 1.2 RELEASE Bedienungsanleitung Seite 13