16 LVM | volume group | partition | physical volume

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When working with LVM, you always start with physical storage device, such as hard disk.
in this example we are starting with hard disk which is sda
When you work from a hard disk, typically you take a partition and mark a partition as physical volume.
Physical volume next goes to volume group.
Logical volumes are created from volume group.
we don't care about physical volumes that are set behind.
Once you created logical volume, you will get device with name /dev/vgroup/logvol (mkfs)
From volume group you can add additional volumes if there is space available.
If there is no space available we can add physical volumes to the volume group

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