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hardware compatibility list
redhat.com/docs/manuals |
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| where is some basic information stored on the installed packages |
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| view all the interrupts currently in use |
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| how many DMA channels are there, what are they |
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| find the assigned DMA channels |
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| direct memory address, bypasses the CPU for direct data exchange between devices |
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| serial attached SCSI, faster technology to replace SCSI drives |
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| what does SCSI stand for, what are the two fastest SCSI types |
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Small Computer System Interface
Ultra320 (320 MB/s)
Ultra640 (640 MB/s) |
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SCSI controller card, AKA
Host Bus Adapter |
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| Advanced Configuration and Power Interface |
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Hardware Abstraction Layer
-software layer to function between the kernel and the system hardware
hald |
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| runs in the background and will detect hardware changes, if new hardware is a USB or CD/DVD drive it will mount the device |
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| show a list of all detected hardware on the system |
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| view hardware device in graphical mode. text mode |
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hal-device-manager (may need to be installed)
hal-device (text) |
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| kudzu scans the system and compares found devices against /etc/sysconfig/hwconf -no differences, no action, or it updates hwconf with the new device or removes old devices |
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| run kudzu, but don't configure or remove any devices |
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| run kudzu on the PCI bus, but don't configure or remove any devices |
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| run kudzu for network devices, but don't configure or remove any devices |
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| daemon that gets device add and delete information from the kernel and passes it to udev |
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| where are the configuration files for udev |
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| specifies the locations for device files, udev rules, and appropriate log level (err, info, or debug) |
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| what are the udev configuration defaults |
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| devices are in /dev, rules are in /etc/udev/rules.d, and the default log level is err. |
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| contains rules to be applied to devices added or removed |
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| query and display device info |
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| simulate a udev execution for a device |
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| displays kernel and udev events |
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| requests kernel device events for cold plugged devices |
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| udevinfo -a -p /block/sde/sde |
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| display all info about a specific device, sda |
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| you've done udevinfo -e (all devices) now what do you do to query sda |
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find the device name under P: such as P:/block/sda and then:
udevinfo -a -p /block/sda |
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| good for troubleshooting: a command to display recent diagnostic messages from /var/log/dmesg |
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| list all pci devices - make it more readable |
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| show the major and minor devices numbers for all sd* devices |
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| ls -l /dev/sd*, column 6 shows the major number (8), column 8 shows the minor number (unique) |
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