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http://www.snia.org/education/tutorials/2006/fall/virtualization/Storage_Virtualization-I.pdf

At the moment, your storage, your server, the fibre cards, the patching is all different.  Your application sits on a server with a specific operating system, which then has storage presented to it with fibre cards.  The operating system then works with the network attached storage to have a data drive.  When this drive needs to be upgraded, it can take days to do so:

* You might need a new volume on another rig – the rig might be full – more patching required

* Your operating system might not support a bigger drive

* Your storage team might require that you use emulex and not q-logic cards for san connectivity

* You might need to get another disk presented then copy the data

* You might not have the space right now, so you need to purchase a new emc rig

With virtual storage, there is a layer between your server and the storage. You server access filespace 7 and writes there, filespace 7 could be comprised of two different emc disks/volumes in different sites, it’s not your concern. You write to filespace 7, the virtual storage does the rest. Very cool, obviously needs to evolve into a supportable industrial solution.

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