Novell LINUX ENTERPRISE SERVER 10 - ARCHITECTURE-SPECIFIC INFORMATION... Manual

SUSE Linux Enterprise
Server
www.novell.com10
December11,2006 Architecture-Specific Information

Architecture-Specic Information
List of Authors: Berthold Gunreben
List of Authors: Karl Eichwalder, Berthold Gunreben, Jana Jaeger, Thomas Rölz, Tanja Roth, Thomas
Schraitle, Frank Sundermeyer
List of Authors: Vistatec , Rebecca J. Walter
This publication is intellectual property of Novell Inc.
Its contents can be duplicated, either in part or in whole, provided that a copyright label is visibly lo-
cated on each copy.
All information found in this book has been compiled with utmost attention to detail. However, this
does not guarantee complete accuracy. Neither SUSE LINUX GmbH, the authors, nor the translators
shall be held liable for possible errors or the consequences thereof.
Novell, the Novell logo, the N logo and SUSE are registered trademarks of Novell, Inc. in the United
States and other countries. * Linux is a registered trademark of Linus Torvalds. All other third party
trademarks are the property of their respective owners.

Contents
Introduction v
1System Requirements for Operating Linux 1
1.1 Hardwareforx86......................... 1
1.2 Hardware for Itanium . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Hardware for AMD64 and Intel 64 . . . . . . . . . . . . . . . . . . 4
2Controlling the Installation 5
2.1 Installation on the Computer Console . . . . . . . . . . . . . . . . . 5
2.2 Installation Using a Serial Console . . . . . . . . . . . . . . . . . . 5
2.3 Installation with SSH . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Installation over VNC . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5 Installation with AutoYaST . . . . . . . . . . . . . . . . . . . . . . 7
3Boot and Installation Media 9
3.1 BootMedia............................ 9
3.2 InstallationMedia......................... 10
4Dealing with Boot and Installation Problems 11
4.1 ProblemsBooting......................... 11
4.2 Problems Installing . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 Redirecting the Boot Source to the Boot CD . . . . . . . . . . . . . 13

Introduction
This manual describes the steps necessary to prepare for the installation of SUSE®
Linux Enterprise Server on x86, AMD64, Intel 64, and Itanium computers. It introduces
the steps required to prepare for various installation methods and provides useful infor-
mation. Chapters of the Reference manual are referenced where applicable. The list of
hardware requirements provides an overview of supported systems supported by SUSE
Linux Enterprise Server. Find information about available installation methods and
several common known problems. Also learn how to control the installation, provide
installation media, and boot with regular methods.
1 Required Background
To keep the scope of these guidelines manageable, certain technical assumptions have
been made. It is assumed that:
•You have some computer experience and are familiar with common technical terms.
• You are familiar with the documentation for your system and the network on which
it runs.
• You have a basic understanding of Linux systems.
2 Documentation Conventions
The following typographical conventions are used in this manual:
•/etc/passwd: lenames and directory names
•placeholder: replace placeholder with the actual value
•PATH: the environment variable PATH
•ls,--help: commands, options, and parameters
•user: users or groups

•Alt ,Alt +F1 : a key to press or a key combination; keys are shown in uppercase
as on a keyboard
•File,File →Save As: menu items, buttons
•►amd64 ipf: This paragraph is only relevant for the specied architectures. The
arrows mark the beginning and the end of the text block.◄
•Dancing Penguins (Chapter Penguins, ↑Reference): This is a reference to a chapter
in another book.
3 Acknowledgments
The Linux operating system has developed over a period of several years from a one-
man show of the inventor, Linus Torvalds, into a fantastic project to which countless
developers from all over the world have contributed. Thanks are due to everyone who
has helped make this project a success.
vi Architecture-Specic Information

1
System Requirements for
Operating Linux
The SUSE® Linux Enterprise Server operating system can be operated on a wide range
of hardware. It is impossible to list all the different combinations of hardware SUSE
Linux Enterprise Server supports. However, to provide you with a guide to help you
during the planning phase, the minimum requirements are presented here.
If you want to be sure that a given computer conguration will work, nd out which
computers have been certied by SUSE. Find a list of these computers at http://
developer.novell.com/yessearch/Search.jsp.
1.1 Hardware for x86
Computers based on x86 constitute a cost-effective way of building high-performance
systems. The preconditions to operating SUSE Linux Enterprise Server on this platform
are as follows:
CPU
The number of CPUs supported depends on the kernel used. Specically, these are
as follows:
Table 1.1 CPUs Supported by the Kernel
Maximum Number
of CPUs
Oldest CPU TypeKernel
1PentiumPro, Athlonkernel-default
System Requirements for Operating Linux 1

Maximum Number
of CPUs
Oldest CPU TypeKernel
32PentiumPro, Athlon MPkernel-smp
128Pentium II, Athlon XPkernel-bigsmp
Memory Requirements
A minimum of 512 MB is required. The minimum recommended memory is 1 GB.
For a multiprocessor system, 256 MB per processor is required. Systems with less
than 1 GB main memory need additional swap space that extends the virtual
memory to 1 GB.
Hard Disk Requirements
The disk requirements depend largely on the installation. Commonly, you need
more space than the installation software itself needs to have a system that works
properly. Minimal requirements for different selections are:
Hard Disk RequirementsSystem
1.2 GBMinimal X Window System
3.2 GBGNOME Desktop
2.7 GBKDE Desktop
7 GBAll patterns
Boot Methods
The computer can be booted from CD, USB hard drive, oppy, or the network. A
special boot server is required to boot over the network. This boot server can be
congured with SUSE Linux Enterprise Server. To use USB hard drives, the BIOS
or rmware must support booting from USB devices. Create an bootable USB hard
drive with mkbootdisk, which is found on the rst installation CD in the direc-
tory /boot/i386/ or /boot/x86_64. For more information, read the docu-
mentation in the /boot directory.
2Architecture-Specic Information

1.2 Hardware for Itanium
The Itanium architecture is 64-bit and allows operation of large servers.
CPU
Itanium II (older Itanium CPUs are no longer supported). Dual core CPUs and
hyperthreading are also supported.
Maximum Number of CPUs
At most, 1024 CPUs are supported. For the calculation of the CPU count, a dual-
core CPU counts as two CPUs and a hyperthreaded CPU with two siblings also
counts as two CPUs. 1024 CPUs could mean 512 dual cores, 512 single cores with
hyperthreading, or 256 dual cores with hyperthreading.
Memory
A minimum of 1GB RAM per CPU socket is required.
Hard Disk Requirements
The disk requirements depend largely on the installation selected. Commonly, you
need more space than the installed software itself needs to have a system that works
properly. Minimal requirements for different selections are:
Hard Disk RequirementsSystem
4 GBMinimal System
10 GBRecommended
Boot Methods
Options for booting the computer depend on the available hardware. All boot
methods available to the machine should work. A special boot server is required
to use PXE boot over the network. This may also be set up with SUSE Linux En-
terprise Server.
System Requirements for Operating Linux 3

1.3 Hardware for AMD64 and Intel 64
The AMD64 and Intel 64 architectures support the simple migration of x86 software
to 64 bits. Like the x86 architecture, they constitute a value-for-money alternative.
CPU
All CPUs available on the market to date are supported. This includes dual-core
CPUs.
Maximum Number of CPUs
The maximum number of CPUs supported by AMD64 and Intel 64 is 128.
Memory Requirements
A minimum of 512 MB of memory is required. Requirements depend on the appli-
cation. However, the minimum recommended is 1024 MB or 512 MB per CPU on
multiprocessor computers. The theoretical upper limit on the amount of memory
supported by the kernel is 512 GB.
Hard Disk Requirements
The disk requirements depend largely on the installation selected. The required
space for this architecture is similar to x86 but you should plan some space for
compatibility libraries. Minimum requirements for different selections are:
Hard Disk RequirementsSystem
1.4 GBMinimal X Window System
3.5 GBGNOME Desktop
3 GBKDE Desktop
8.5 GBAll patterns
Boot Methods
The computer can be booted from CD or network. A special boot server is required
to boot over the network. This can be set up with SUSE Linux Enterprise Server.
4Architecture-Specic Information

2
Controlling the Installation
Control the installation in one of several ways. The method most frequently used is to
install SUSE® Linux Enterprise Server from the computer console. Other options are
available for different situations. Find more information about the available installation
methods in Chapter 2, Deployment Strategies (↑Installation and Administration).
2.1 Installation on the Computer
Console
The simplest way to install SUSE Linux Enterprise Server is using the computer console.
With this method, a graphical installation program guides you through the installation.
This installation method is discussed in detail in Chapter 3, Installation with YaST
(↑Installation and Administration).
You can still perform the installation on the console without a working graphics mode.
The text-based installation program offers the same functionality as the graphical version.
Find some hints about navigation in this mode in Section 7.11.1, “Navigation in Mod-
ules” (Chapter 7, System Conguration with YaST, ↑Installation and Administration).
2.2 Installation Using a Serial Console
For this installation method, you need a second computer that is connected by a null
modem cable to the computer on which to install SUSE Linux Enterprise Server. De-
Controlling the Installation 5

pending on the hardware, even the rmware or BIOS of the computer may already be
accessible to the serial console. If this is possible, you can carry out the entire installation
using this method. To activate the serial console installation, additionally specify the
parameter console=ttyS0 at the boot promptdirectly after the boot process has
completed and before the installation system starts.
On most computers, there are two serial interfaces, ttyS0 and ttyS1. For the installation,
you need a terminal program like minicom or screen. To initiate the serial connection,
launch the screen program in a local console by entering the following command:
screen /dev/ttyS0 9600
This means that screen listens to the rst serial port with a baud rate of 9600. From this
point on, the installation proceeds similarly to the text-based installation over this ter-
minal.
2.3 Installation with SSH
If you do not have direct access to the computer hardware and, for example, the instal-
lation should be launched from a management console, control the entire installation
process over the network. To do this, enter the parameters UseSSH=1 and
SSHPassword=<secret> at the boot prompt. An SSH daemon is then launched in
the system and you can log in to the system as user root with the password “secret”.
To connect, use the command ssh -X root@<ipaddr>.
If you do not have a DHCP server available in your local network, manually assign an
IP address to the installation system. Do this by entering the option
HostIP=<ipaddr> at the boot prompt.
As soon as you are logged in to the installation system, launch the actual installation
with the command yast for a text-based installation or yast2 to proceed with the
graphical installation. This then guides you through the installation. This procedure is
described in detail in Section 4.1.5, “Simple Remote Installation via SSH—Dynamic
Network Conguration” (Chapter 4, Remote Installation, ↑Installation and Administra-
tion).
6Architecture-Specic Information

2.4 Installation over VNC
If you do not have direct access to the system, but want a graphical installation, install
SUSE Linux Enterprise Server over VNC. This method is described in detail in Sec-
tion 4.5.1, “VNC Installation” (Chapter 4, Remote Installation, ↑Installation and Ad-
ministration).
As suitable VNC clients are also available for other operating systems, such as Microsoft
Windows and MacOS, the installation can also be controlled from computers running
those operating systems.
2.5 Installation with AutoYaST
If you need to install SUSE Linux Enterprise Server on a number of computers with
similar hardware, it is recommended to perform the installations with the aid of Auto-
YaST. In this case, start by installing one SUSE Linux Enterprise Server and use this
to create the necessary AutoYaST conguration les.
AutoYaST is extensively documented in Chapter 5, Automated Installation (↑Installation
and Administration).
Controlling the Installation 7

3
Boot and Installation Media
When installing the system, the media for booting and for installing the system may be
different. All combinations of supported media for booting and installing may be used.
3.1 Boot Media
Booting a computer depends on the capabilities of the hardware used and the availabil-
ity of media for the respective boot option.
Booting from CD or DVD
This is the most common possibility of booting a system. It is straightforward for
most computer users, but requires a lot of interaction for every installation process.
Booting from a USB Hard Drive or Floppy Disk
Depending on the hardware used, it is possible to boot from a USB hard drive or
a oppy disk. The respective media must be created with the utility mkbootdisk,
which can be found together with its documentation on the rst CD or DVD in the
directory /boot/<architecture>.
Booting from the Network
You can only boot a computer directly from the network if this is supported by the
computer's rmware or BIOS. This booting method requires a boot server that
provides the needed boot images over the network. The exact protocol depends on
your hardware. Commonly you need several services, such as tftp and dhcp or
pxeboot. If you need a boot server, also read Section 4.1.3, “Remote Installation
Boot and Installation Media 9

via VNC—PXE Boot and Wake on LAN” (Chapter 4, Remote Installation, ↑Instal-
lation and Administration).
3.2 Installation Media
The installation media contain all the necessary packages and meta information that is
necessary to install a SUSE Linux Enterprise Server. These must be available to the
installation system after booting for installation. Several possibilities to provide the
installation media to the system are available with SUSE Linux Enterprise Server.
Installation CD or DVD
All necessary data is delivered on the boot media. Depending on the selected instal-
lation, if you install a CD version, several disk changes may be necessary.
Networked Installation
If you plan to install several systems, providing the installation media over the
network makes things a lot easier. It is possible to install from many common
protocols, such as NFS, HTTP, FTP, or SMB. For more information about how to
run such an installation, refer to Chapter 4, Remote Installation (↑Installation and
Administration).
10 Architecture-Specic Information

4
Dealing with Boot and
Installation Problems
Prior to delivery, SUSE® Linux Enterprise Server is subjected to an extensive test
program. Despite this, problems occasionally occur during boot or installation.
4.1 Problems Booting
Boot problems may prevent the YaST installer from starting on your system. Another
symptom is when your system does not boot after the installation has been completed.
Installed System Boots, Not Media
Change your computer's rmware or BIOS so that the boot sequence is correct. To
do this, consult the manual for your hardware.
The Computer Hangs
Change the console on your computer so that the kernel outputs are visible. Be sure
to check the last outputs. This is normally done by pressing F2 . If you are unable
to resolve the problem, consult the SUSE Linux Enterprise Server support staff.
To log all system messages at boot time, use a serial connection as described in
Chapter 2, Controlling the Installation (page 5).
The Itanium Boot Loader
If you have manually altered the kernel or initrd on your system, run
/sbin/elilo before shutting down the computer. If you leave out this step,
your system may not be bootable.
Dealing with Boot and Installation Problems 11

Boot Disk
The boot disk is a useful interim solution if you have difculties conguring the
other possibilities or if you want to postpone the decision regarding the nal boot
mechanism. A boot disk may also be a suitable solution in connection with OS/2
or Windows NT.
This approach only works if your system has a oppy drive. The boot disk can be
created with YaST. See Section 7.5.3, “Boot and Rescue Disks” (Chapter 7, System
Conguration with YaST, ↑Installation and Administration).
Virus Warning after Installation
There are BIOS variants that check the structure of the boot sector (MBR) and er-
roneously display a virus warning after the installation of GRUB or LILO. Solve
this problem by entering the BIOS and looking for corresponding adjustable settings.
For example, switch off virus protection. You can switch this option back on again
later. It is unnecessary, however, if Linux is the only operating system you use.
4.2 Problems Installing
If an unexpected problem occurs during installation, information is needed to determine
the cause of the problem. Use the following directions to nd useful information:
• Check the outputs on the various consoles. You can switch consoles with the key
combination Ctrl +Alt +Fn . For example, obtain a shell in which to execute various
commands by pressing Ctrl +Alt +F2 .
• Try launching the installation in failsafe mode. If the installation works without
problems in this case, there is an incompatibility that causes either ACPI or APIC
to fail. In some cases, a BIOS or rmware update xes this problem.
• Check the system messages on a console in the installation system by entering the
command dmesg.
12 Architecture-Specic Information

4.3 Redirecting the Boot Source to
the Boot CD
To facilitate the installation process and avoid accidental installations, the default setting
on the installation CD for SUSE® Linux Enterprise Server is that your system is booted
from the rst hard disk. At this point, an installed boot loader normally takes over
control of the system. This means that the boot CD can stay in the drive during an in-
stallation. To start the installation, choose one of the installation possibilities in the boot
menu of the media.
Dealing with Boot and Installation Problems 13