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Linux file system

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Transcript

  • 1. LINUX FILE SYSTEM
  • 2. INTRODUCTION TO FILE SYSTEMS
    • The organization method of data on a hard disk volume
    • FAT 12 , FAT 16 , FAT 32
    • NTFS
    • LINUX
  • 3. INTRODUCTION TO LINUX
    • Linus interested in Minix, a small UNIX system, developed LINUX version 0.02 in 1991.
    • Version 1.0 released in 1994, 2.2 in 1999.
    • Today used on 7-10 million computers
    • corporate computer network and Web servers
  • 4. MULTI USER & MULTI TASKING SYSTEM
      • Runs on multiple hardware platforms
      • Users like its speed and stability
      • No requirement for latest hardware
      • Virtual memory, shared libraries, memory management formerly found on mainframe computers.
      • Specific directory accessable to user and administrator only, directory also contains user specific settings
  • 5. THE LINUX SYSTEM
    • User commands includes executable programs and scripts
    • The shell interprets user commands. It is responsible for finding the commands and starting their execution. GUI is NOT Required
    • The kernel manages the hardware resources for the rest of the system.
  • 6. THE LINUX FILE SYSTEM
    • Linux files are stored in a single rooted, hierarchical file system
    • Linux places all the partitions under the root directory by 'mounting' them under specific directories.
    • LINUX is case sensitive i.e PRESENTATION & presentation are different.
    / etc home usr passwd inittab neale scully marty a b Directories User home directories Data files root
  • 7. LINUX FILE SYSTEM LAYOUT
  • 8. FEATURES OF LINUX
    • Proper shutdown required otherwise lengthy file-system check is done to recover corrupt files.
    • Unified file system.
  • 9. SECOND EXTENDED FILE SYSTEM
    • ext2
    • From early 90's, ext2 has been the default file system.
    • Linux systems are extremely robust and less prone to crashes risk of data loss when these sudden crashes occur.
    • Main advantage to the ext2 filesystem is its speed.
    • On system crash ext2 need integrity checks that, depending on your hard disk size, may take an extremely long time.
  • 10. JOURNALING FILE SYSTEMS
    • Concept of journaling
    JOURNALING FILE SYSTEMS ext 3 ReiserFS ext 4
  • 11. OUTCOMES OF JOURNALING
    • Extended file system 3 (ext3)
    • Developed in 1999
    • Robust, fast, minimum downtime
    • stores the file name and its location in database
    • System check every 30 days to avoid corruption
    • ext2 filesystem can be converted to an ext3 fairly easily on a working system
    • ReiserFS
    • Version 3 more used than version 4
    • stores both the file names and the file itself in a database
    • ReiserFS needs a clean install to use
    • Extended file system 4 (ext4)
    • Launched in 2008
    • Large file system up to 16 terabytes
    • Delayed allocation improves performance and reduces fragmentation by improving block allocation decisions based on the actual file size.
  • 12.  
  • 13. THANK YOU

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