Journaling Filesystems How Their different

• Transaction logs

  • Two different types
    • First type stores metadata into the log. (creation,size,etc)
    • Second type stores intermediate disk writes into the log and then "commits" them to the filesystem at measured intervals.

• Consistency

  • JFS's attempts to keep the filesystem in as much a complete state as possible

• Speed of Recovery

  • Log replays are much faster than fsck, especially for large volumes