D.2. Metadata Contents

D.2. Metadata Contents

D.2. Metadata Contents

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


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