Re: LVM question. Missing about 11GB of Space..

From: Alexander Dalloz (ad+lists_at_uni-x.org)
Date: 10/29/05

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    To: For users of Fedora Core releases <fedora-list@redhat.com>
Date: Sat, 29 Oct 2005 18:14:47 +0200

    Am Sa, den 29.10.2005 schrieb Michael D. Setzer II um 17:19:

    > 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.

    This has nothing to do with LVM. Please see "man mkfs.ext{3,2}" -> -m
    reserved-blocks-percentage

    "Specify the percentage of the filesystem blocks reserved for the
    super-user. This value defaults to 5%."

    Alexander 

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