Many times a customer only wants virtualization because they just need a non-disruptive way to move storage around without taking applications down. If that is all that is required, nearly every operating system already has a disk virtualization subsystem built in: the logical volume manager. Use it first.
Physical virtualization tools only make sense all the other available optimization techniques have been exhausted. Once this is done, this customer will be pretty well evolved and will understand some of the consequences of adding another obfuscating layer to the complex stack of products connecting applications to disk.
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