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Thin Provisioned Storage

Thin provisioned storage is "just enough just-in-time" storage.  It is designed for capacity management (getting the most GB/$) in a shared SAN environment (I call these Virtualized SANs.  It also makes life a little easier from a capacity administration perspective.  

TP does nothing for performance (other than possibly making it a little worse).  Some SAN vendors provide QOS to a least provide some hosts with priority over others and of course lowering the Q depth on your less important HBAs will help.  This only really needs to be done if the less important hosts have activity spikes that conflict with the essential hosts.  

If performance is your concern, TP should raise your eyebrow, as should oversubscribing, and certain other SAN tricks that are performance-draining.  

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