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4 D No, you failed to diagnose the cause of the error message The most likely cause of the problem is simply a floppy diskette advertently left in a floppy drive and the system is trying to boot from it A, B, and C are incorrect A is incorrect because you didn t identify the cause of the problem before trying to fix it B is incorrect There s probably nothing wrong with the GRUB bootloader on the hard disk C is incorrect There s probably nothing wrong with the hard drive 5 D and E The sar 60 5 and sar u 60 5 commands generate a snapshot of your system s CPU performance using five measurements 60 seconds apart A, B, and C are incorrect A takes a snapshot of CPU performance using 60 measurements five seconds apart B takes a snapshot of I/O performance C would take a snapshot of RAM and virtual memory performance using 60 measurements five seconds apart 6 C The us column in the vmstat output lists CPU time spent running user processes A, B, and D are incorrect A is displayed in the b column B is displayed in the free column D is displayed in the r column 7 A and D The head /var/log/messages and the less /var/log/bootmsg commands will display the first few lines of the file on screen B, C, and E are incorrect B will display the last few lines of the file C uses incorrect syntax ( l) E will not pause the output to allow you to view the first lines of the file
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16: Documenting and Troubleshooting the System
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8 B The dateext directive will cause old, archived log files to be saved using the current date in the file name extension A, C, and D are incorrect A will cause the file to not be rotated if it is empty C specifies the number of days between rotations D is used to specify the permissions to be applied when creating the log file 9 D The f option, when used with tail, will cause it to monitor a file for changes and display them on the screen A, B, and C are incorrect Each of these options is invalid when used with tail 10 B The most likely cause is that the DNS server is down or the wrong address has been entered in /etc/resolvconf A, C, and D are incorrect A is incorrect If the system can ping Internet hosts by IP address, then routing is working correctly C is incorrect If the host can route out correctly and ping Internet hosts, then the correct subnet mask has probably been used D is incorrect If the firewall were blocking ICMP traffic, the ping packets wouldn t be allowed through 11 C The most likely cause of the problem is outdated BIOS firmware that won t allow the system to address a disk larger than 130GB A, B, and D are incorrect A and B are incorrect because the operating system hasn t been loaded yet D is incorrect A misconfigured master/slave jumper won t cause part of the disk to be unaddressable
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The issue in this scenario is a corrupted root partition You should first try to repair the file system using fsck To do this, you would first boot the system from the installation CD In the welcome screen, you need to select Linux Rescue When the system has booted, log in as root Then run fsck on the / partition If this doesn t work, you ll need to use fdisk to repartition the disk (or create a partition on a new disk if the disk itself is bad) Then use mkfs to re-create the file system Mount the file system in / and then restore files from your backup Alternatively, you could simply re-install the system from scratch and restore the data from backup
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