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Regardless of which distribution you choose, make sure you download the correct version for your system s architecture For example, if you are going to install Linux on a Pentium IV CPU, then you need the x86 version of your distribution If your hardware uses an AMD Athlon 64 CPU, then you need x86-64 version of the distribution If you pick the wrong one, most Linux installers will generate an error and you won t be able to complete the installation With hardware issues out of the way, you can now move on to the next component of your plan where you will specify how the Linux file system will be configured Let s discuss this topic next
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3: Installing Linux
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When planning a Linux implementation, you need to include specifications for how the file system will be created and maintained on the system s hard disk drive This is yet another unique aspect of the Linux operating system When implementing other operating systems, such as Microsoft Windows, you usually create only a single disk partition and format it using the NTFS file system
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SCENARIO & SOLUTION
You re installing SUSE Linux on a PC that uses a Pentium III 700 MHz CPU Which SUSE Linux distribution architecture should you download You re installing SUSE Linux on a PC that uses an AMD Turion 64 CPU Which distribution architecture should you download The Pentium III CPU uses the 32-bit x86 CPU architecture Therefore, you should download the x86 version of the distribution The Turion 64 uses the 64-bit x86 architecture Therefore, you should download the x86-64 version of the distribution
Plan a Linux Installation
Technically, you do have the option of selecting from the NTFS or FAT 32 file systems when installing a Windows 2000 or XP system However, FAT 32 has so many limitations, such as a lack of support for permissions, that very few system administrators use it With Linux, however, you have many more choices to make You can customize how your disk will be partitioned and what file system will be used In this part of the chapter, we ll discuss the following:
Choosing a file system Planning your partitions
Let s begin by discussing file systems
Choosing a File System
Back in 2, we discussed how a hard disk drive works We related that the drive is made up of multiple aluminum platters each with two read-write heads that are used to read and write data When conducting disk I/O operations, the operating system needs to know where data is stored, how to access it, and where it is safe to write new information This is the job of the file system Its role is to reliably store data on the hard drive and organize it in such a way that it is easily accessible When you use a file browser to navigate through the directories on a hard disk drive and open a file, it s the file system that makes the entire process possible Most Linux distributions offer a wide variety of file systems that you can choose from In this topic, we ll review three of the most widely used types:
ext2 ext3 Reiser
Let s begin by discussing the ext2 file system
ext2 The ext2 file system is one of the oldest Linux file systems still available The acronym ext2 stands for Second Extended File System It was originally introduced back in 1993 It stores data in the standard hierarchical fashion used by most other file systems Data is stored in files; files are stored in directories A directory can contain either files or other directories called subdirectories
3: Installing Linux
The maximum file size supported in the ext2 file system is 2 terabytes (TB) An ext2 volume can be up to 4TB File names can be up to 255 characters long The ext2 file system supports Linux file system users, groups, and permissions (called POSIX permissions) It also supports file compression The ext2 file system is a fantastic file system It s been around a long time, long enough for most of its bugs to be worked out In fact, it s probably the most widely used Linux file system ever implemented It s also reputed to be the fastest Linux file system available However, ext2 has one key weakness that has led to the development of other file systems This is the fact that ext2 takes a long time to recover if the system shuts down abruptly When shutting down the Linux system, the operating system first cleanly dismounts the file system During the dismount, the operating system makes sure all pending file system transactions are written to disk before the system shuts off The problem arises when the system is shut down without completing this clean dismount procedure For example, suppose a power outage occurs and the Linux system shuts off suddenly without going through the proper shutdown procedure When this happens, it is possible that pending disk transactions weren t completed To clean up the file system, the ext2 file system will automatically run a program called e2fsck the next time the system is booted This utility tries to fix any problems that were created when the system went down without properly dismounting the disk If it finds non-allocated files or unclaimed blocks of data, it will write this information in a directory called lost+found By doing this, ext2 tries to ensure that data integrity is maintained in spite of the improper shutdown The issue here is that e2fsck will analyze the entire file system when this happens, not just the last few files that were in the process of being modified On a basic Linux system, this can take from 10 to 15 minutes On an extensive system that has a lot of file system data (such as a network file server), this process can take several hours It s bad enough that the system went down unexpectedly in the first place; now you have to wait hours for it to start back up again! Because of this issue, two other Linux file systems have started replacing ext2 The first of these is ext3 Let s discuss this file system next
ext3 The ext3 file system is an updated version of ext2 In fact, ext3 stands for Third Extended File System In fact, most of the file system utilities used by ext2 are also used by ext3 You can easily upgrade disks using the ext2 file system to ext3 You can even downgrade an ext3 disk to ext2
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