IT Essentials II Network Operating Systems

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IT Essentials IINetwork Operating Systems

• Chapter 12Installing and Maintaining Hardware in
  Linux

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Hardware

• Main problem in Linux is the drivers
• Devices to help troubleshoot network problems
• Tone generator/locator (fox and hound)
• Tone to help identify correct cable
• Crossover cable
• Time domain reflectometer (TDR)
• Measures pulse to locate breaks/shorts in cable
• Hardware loopback
• Digital volt-ohm meter
• Cable tester
• Oscilloscope
• LAN meter

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Hardware Drivers
4
Common IRQ Default Assignments

• /proc/interrupt
• /proc/dma
• /proc/ioports

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Linux Kernel Modules

• Two files handle module configuration
• /etc/modules.conf
• Information for specific task modules
• How kernel loads and unloads modules
• /lib/modules/x.x.x (version number)
• Information about module dependencies

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SCSI Installation

• Installation factors
• SCSI variant
• Better to be of same type
• Can be different
• SCSI ID
• Ensure unique numbering
• Termination
• See next slide
• Cable quality
• Will effect newer devices
• Cable length
• Different lengths for different variants

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SCSI Termination
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BIOS

• Available through CMOS configuration Utility
• If not configured may get strange results through
  boot-up
• Set passwords
• Adjust memory settings
• Boot order

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Troubleshooting

• EIDE
• Failed disk
• Bugs in controllers
• Wrong drivers
• Use hdparm to test and configure
• SCSI
• Termination
• Forked chains
• ID
• cable

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Troubleshooting

• Peripheral devices
• Drivers
• Cables
• Ports
• Hardware problems
• POST
• oopses
• Dont show until after boot-up

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Laptop and Mobile Devices

• Modems
• Software modems
• Little drivers available
• Networking
• Again drivers
• Display
• Again drivers for LCD
• Power Management
• apmd daemon
• May need to add to /etc/rc.d/rc.local
  configuration file
• PC cards
• Require PC card driver package installed

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Questions?