Confusion Regarding Physical Volume,Volume Group,Logical Volume,Physical partition

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http://www.unix.com – Hi, I am new to unix. I am working on Red Hat Linux and side by side on AIX also. After reading the concepts of Storage, I am now really confused regarding the terminologies 1)Physical Volume 2)Volume Group 3)Logical Volume 4)Physical Partition Please help me to understand these concepts. (HowTos)