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Each of these components is modular You can choose from a variety of packages to customize your graphical environment to suit your tastes We spent the rest of the chapter discussing how to configure your X Server software and your window manager We pointed out that you should avoid directly editing your X Server configuration file Instead, you should use a configuration utility to avoid mistakes
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that could potentially damage your hardware Depending on your distribution, you can use one of the following utilities:
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YaST system-config-display system-config-keyboard system-config-mouse xorgconfig or xorgcfg xf86config or xf86cfg xvidtune
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To specify your default window manager, you need to edit a hidden configuration file in your user s home directory The name of the file depends on your distribution and your default runlevel:
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xinitrc (runlevel 3) Xsession (runlevel 5) Xdefaults (runlevel 5) Xclients (runlevel 5)
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Manage Hardware and Kernel Modules
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Drivers are small programs that are loaded into RAM that enable the CPU to
communicate with a particular hardware component
For basic system components, driver software is stored in the BIOS Other components require that a driver that is stored on the hard disk be
loaded into RAM
On Linux, drivers can be loaded in two ways: Loaded as kernel modules after the operating system has started Compiled directly into the kernel itself You can view information about your system hardware within the /proc
directory
You can use the following command-line tools to view information about the
hardware in your system:
hdparm a /dev/device sg_scan scsiinfo l pnpdump lsusb You can use the following command-line utilities to manage kernel modules: lsmod depmod insmod
Views loaded kernel modules Views module information Builds a module dependency list
modinfo
Installs a kernel module, but doesn t factor in module dependencies Installs or removes a kernel module while taking module dependencies into account Removes a kernel module
modprobe rmmod
modprobe uses the /etc/modprobeconf file to determine which kernel
modules should be loaded at boot
12: Con guring Hardware
Configure Power Management
Advanced Power Management (APM) is an older standard that used the
BIOS to manage power to hardware in the system
Today, most PCs use Advanced Configuration and Power Interface (ACPI) ACPI divides power management tasks between the BIOS and the operating
system
Linux automatically detects whether or not your motherboard supports ACPI
during installation and enables ACPI support in the kernel
You can add the acpi=on command to the kernel line in your GRUB
configuration file to manually enable ACPI support
You can use either the acpid or the powersaved daemon to configure power
management using rules you specify in the appropriate configuration file
Burn CDs and DVDs
You can use the cdrecord command to burn CDs from the Linux command
line
You can enter cdrecord scanbus to identify your burner hardware Use the mkisofs command to create an iso image file that contains all of the
files you want to burn to the disc
You should mount the iso file you created and verify that it was created
correctly
Use the cdrecord command to burn the iso file to a recordable optical disc You can also use a wide variety of graphical utilities, such as K3b, to burn
CDs and DVDs
Implement RAID
RAID groups multiple disks together into an array using a RAID controller
card or through software stored in RAM
The RAID array is presented to the operating system as a single hard drive RAID uses the following strategies: Striping Mirroring Parity
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RAID implements these strategies in levels Some of the more commonly used RAID levels include the following: RAID 0 RAID 1 RAID 3 RAID 5
Striping Mirroring Parity Parity Mirroring two or more RAID 0 arrays Striping two or more RAID 1 arrays Striping two or more RAID 5 arrays Mirroring two or more RAID 5 arrays
RAID 0+1 RAID 1+0 RAID 5+0 RAID 5+1
One RAID level isn t inherently better than any other RAID level RAID can be implemented using hardware RAID controllers or by using
software included with most operating systems
Hardware RAID creates arrays from hard disks Software RAID creates arrays from partitions on hard disks
Configure X Windows
The Linux graphical environment is composed of the following components: X Server Window manager Desktop environment You can choose from a variety of packages to customize your graphical
environment
You should use a configuration utility to configure your X Server software to
avoid mistakes that could potentially damage your hardware
You can use one of the following utilities to configure your X Server software: YaST system-config-display system-config-keyboard system-config-mouse xorgconfig or xorgcfg
12: Con guring Hardware
xf86config or xf86cfg xvidtune You can edit a hidden configuration file in your user s home directory to
specify your default window manager:
xinitrc (runlevel 3) Xsession (runlevel 5) Xdefaults (runlevel 5) Xclients (runlevel 5)
Self Test
SELF TEST
Manage Hardware and Kernel Modules
1 You ve just installed an older ISA network board in your Linux system The kernel did not automatically detect the new device How can you load a driver for this network board (Choose two) A B C D E A B C D Load the appropriate driver from the BIOS Insert the appropriate kernel module Recompile the kernel and configure it to support the board Load a Windows driver for the board using emulation mode Embed the driver within a ROM chip on the board itself /lib/modules/version/kernel/drivers /lib/modules/version/drivers /boot/ /usr/modules/version/drivers/kernel
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