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hello to all, i have heard that diff between ext2 and ext3 is journal.but , i couldn't understand about that.so please clear me this one....
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  1. #1
    oky
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    journal file system


    hello to all,

    i have heard that diff between ext2 and ext3 is journal.but , i couldn't understand about that.so please clear me this one.

  2. #2
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    That is true EXT3 is basicly just EXT2 with Journaling added. The big advantage of journaling is that it keeps a journal (list) of all disk read writes. That way if there is a crash it makes it much easier to recover from as there is a record of whether or not a write was completed before failure.
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  3. #3
    Linux User Krendoshazin's Avatar
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    reiserfs is also a journalling filesystem, here's a table of comparisons for all filesystem types
    http://en.wikipedia.org/wiki/Comparison_of_file_systems

    there's also XFS which offers several other benefits such as extents, delayed allocation, and file change log (A file change log differs from a file system's journal.)

    Such a log can serve at least two purposes.

    First, some applications must scan an entire file system to discover changes since their last scan. By reading a file change log, they can avoid this scan. Scanning applications include backup utilities, webcrawlers, search engines, and replication programs.

    Second, the log can serve as an audit record for activity in a file system.
    also here's a detailed explanaition of the journalling filesystem
    http://en.wikipedia.org/wiki/Journalling

    copycon's answer was correct btw, i'm just providing a bit more info

  4. #4
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    Good links, Krendoshazin. Here's another, less artful, but thorough for those who like a good read at bedtime: Filesystems HOWTO from The Linux Documentation Project.
    /IMHO
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