The volume group metadata contains:
Information about how and when it was created
Information about the volume group:
The volume group information contains:
Name and unique id
A version number which is incremented whenever the metadata gets updated
Any properties: Read/Write? Resizeable?
Any administrative limit on the number of physical volumes and logical volumes it may contain
The extent size (in units of sectors which are defined as 512 bytes)
An unordered list of physical volumes making up the volume group, each with:
Its UUID, used to determine the block device containing it
Any properties, such as whether the physical volume is allocatable
The offset to the start of the first extent within the physical volume (in sectors)
The number of extents
An unordered list of logical volumes. each consisting of
An ordered list of logical volume segments. For each segment the metadata includes a mapping applied to an ordered list of physical volume segments or logical volume segments