When organizations virtualize, they typically overrun the I/O capabilities of the underlying storage infrastructure and aren't able to scale the virtual infrastructure as far as they would like. Instead of asking "why" and getting to the root of the problem of performance bottlenecks, they typically run blindly into an expensive rip-and-replace of the SAN architecture to create more I/O overhead and try to "flash" their way out of performance issues. More recently, administrators have begun to discover you can't "flash" your way out of virtual machine (VM) performance issues without overspending on hardware if you ignore the two big I/O taxes in a virtual environment that inflates IOPS requirements and steals bandwidth from server to storage ...
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