Avoiding storage virtualization for dummies - Computerworld:

Users continue to avoid network-based block virtualization like the plague. Yet what I can't understand is why you would implement a storage-area network (SAN) without it. It's akin to implementing a WAN without a routing table.

SAN virtualization can lower storage costs, simplify SAN management and allow users to replicate and migrate data between different tiers of storage. But if you plan to continue living in the past, here are some reasons you can cite to help you stay there:

A somewhat amusing look at the excuses people use to avoid storage virtualization.