[linux-lvm] VGDA Question

Luca Berra bluca at comedia.it
Thu Sep 8 07:14:23 UTC 2005

On Wed, Sep 07, 2005 at 07:46:00AM -0700, Rik Herrin wrote:
> According to the LVM man page, the VGDA (Volume Group
>Descriptor Area) holds the metadata responsible for
>keeping information about the LVs.  However, it is
>contained in the PVs.  Why does the VGDA contain both
>LV descriptors and PE descriptors?  Shouldn't it just
>have PE descriptors and leave the LV descriptors to
i tried, but fail to understand your question.
The VGDA is the only place on disk where information necessary for
activation of the volume group and contained logical volume can be
stored permanetly.

>the volume group?  Also, when booting, what makes the
>kernel know that there are VGs and LVs?  Does it look
The kernel doesn't. lvm is setup by user space tools.

>Finally, where exactly is the VGDA information held?. 
>Thanks for your time.
at the beginning of the PV

Luca Berra -- bluca at comedia.it
        Communication Media & Services S.r.l.
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