If you mean professional engineer then your answer will depend on your country of origin. In the US, you do not need to have a degree. Check out the NYS PE licensure educational/experience requirements table here: Table Without a degree, it requires you to have six years of relevant, recorded, and proven experience until you are eligible to sit for the Fundamentals of Engineering examination.
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A volume group (VG) is a logical collection, or purposeful grouping, of computer storage space that may span multiple physical devices. It combines both physical and logical volumes into a single administrative element within UNIX&reg and LINUX&reg logical volume management (LVM). A physical volume may be an internal or external storage device. Logical volumes are concatenations, or chained lists, of storage space that might join portions of several physical volumes. Under LINUX&reg, the volume group is the highest level of abstraction, or visualization, in its logical volume manager utility.