LVM question. Missing about 11GB of Space..

From: Michael D. Setzer II (mikes_at_kuentos.guam.net)
Date: 10/29/05

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    To: fedora-list@redhat.com
Date: Sun, 30 Oct 2005 01:19:15 +1000

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    In doing a backup of a 250GB drive, I was surprised to have a
    compressed image that was larger than the used space. In the past,
    I've compressed an 80GB drive with 3 OS's, and get a 14GB image.
    This is a 250GB drive with only 1 OS, and it is producing an 18GB
    image. All free space is zeroed out. In doing some research, it
    appears that about 5% of the LVM partition is being used in some
    fashion that I am not aware of.

    The drive shows the volume size as 229GB with 12GB uses, and
    206GB Free. That leaves about 11 - 12 GB missing.

    Whatever is in this 5% of the drive doesn't appear to compress very
    well with either lzop or gzip. With lzop the image is about 18GB and
    16GB with gzip, but lzop only takes about 2 hours, whereas gzip
    takes about 3 1/2 hours. The image only seems to be runing fine
    until it gets to the end were this 5% seems to be, and it grows
    rapidly.

    Any info on what this 5% is. I'm using g4l, which uses dd to copy the
    raw partition information, and uses lzop or gzip compression. I was
    thinking it might be some kind of swap, but why it would be 5% of
    the disk size, as compared to the amount of ram.

    Thanks.

    +----------------------------------------------------------+
      Michael D. Setzer II - Computer Science Instructor
      Guam Community College Computer Center
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      mailto:msetzerii@gmail.com
      http://www.guam.net/home/mikes
      Guam - Where America's Day Begins
    +----------------------------------------------------------+

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