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Use Removable Media
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FIGURE 6-45
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Mounting a USB flash drive
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As with any other device, you can add an entry to your /etc/fstab file to make the process easier In addition, you must unmount the device before you remove it from the system using the umount command Let s practice mounting devices in the following exercise
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SCENARIO & SOLUTION
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You need to mount a CD that you ve inserted in your system s CD drive Assuming your CD-ROM drive is the master drive on the secondary IDE channel, what command would you enter to mount it in /mnt/cdrom How does Linux view USB or FireWire removable devices You would enter mount t iso9660 /dev/hdc /mnt/ cdrom
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It sees them as additional SCSI devices
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6: Managing the Linux File System
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EXERCISE 6-5
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ON THE CD
Mounting Removable Media
In this exercise, you will practice mounting removable media Complete the following: 1 With your system up and running, open a terminal session 2 Change to your root user account 3 Insert a formatted floppy diskette into your system s floppy drive 4 At the shell prompt, enter mount t vfat /dev/fd0 /media/floppy (SUSE) or mount t vfat /dev/fd0 /mnt/floppy (Fedora) 5 Change to your floppy disk by entering cd /media/floppy or cd /mnt/floppy 6 Get a listing of the files on the disk by entering ls 7 Change to your home directory by entering cd 8 Unmount the floppy by entering umount /dev/fd0 9 Switch back to your regular user account by entering exit Now that you know how the Linux file system works and how to complete common file system tasks, let s talk about how you go about backing up the file system
CERTIFICATION OBJECTIVE 605
Back Up Data
One of the key roles that you must perform as a Linux system administrator is to ensure that the data on the systems you are responsible for is protected One of the best ways that you can do this is to back up the data Having a backup creates a redundant copy of the data so that if a disaster occurs, the data can be restored It s important that you remember that data is stored, for the most part, on mechanical devices in your Linux system Hard drives have motors and other moving parts that slowly wear out over time In fact, hard drives usually have a mean time between failures (MTBF) value assigned to them by the manufacturer This MTBF basically gives you an estimate of how long a drive will last before it fails Basically, it s not a matter of if a hard drive will fail, it s a matter of when
Back Up Data
I relate this because I want you to take backing up seriously Many system administrators, frankly, get very lazy about running backups It s an easy task to blow off, thinking I ll run a backup tomorrow Before you know it, it s been weeks since the last time you ran a backup If you re employed by an organization to maintain their systems and you fail to run backups, I can just about guarantee that you will lose your job if a disaster happens Several years ago, I participated on a support call with a system administrator whose system had completely died He had called us in a last-ditch effort hoping that we would have some kind of magic solution that would get his system back When we told him that we couldn t and that he would have to reinstall and restore from his backups, there was silence on the other end of the phone for a long time He got a little choked up and whispered I don t have any backups I m going to lose my job over this Take my advice, develop a backup plan and stick to it religiously There are several components to a backup plan In this part of this chapter, we re going to discuss the following:
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