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A LUN is a Logical Unit Number, which is really a logical volume. The operating systems and the software on them operate against a logical volume and view it as a linear address space of fixed size blocks. A physical disk can be set up to be one large LUN or carved up into multiple LUNs. In addition, you can add software into the program stack called a Logical Volume Manager that will take LUNs or parts of LUNs and logically combine them using software tables and pointers to virtualize a LUN. So you can use the disk as is, but it is defined as a single large LUN in that case.
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