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Storage Networking Fundamentals: An Introduction to Storage Devices, Subsystems, Applications, Management, and Filing Systems by Marc Farley

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The Concept of Storage Virtualization

Storage virtualization is the storing-level process for forming “upstream” storage address spaces (block storage) from downstream storage address spaces (typically logical units [LUs] exported by storage subsystems). Figure 12-1 shows a virtual storage address space on the left being formed from a virtualization process acting on two other storage address spaces on the right.

Figure 12-1. The Creation of Upstream Virtualized Storage Structures

The terms downstream and upstream define I/O path directions. Something that is downstream is in the direction going away from the host. It's no surprise, then, that ...

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