IBM XIV vs SVC Smallest LUN Size

I am trying to learning more about the IBM XIV and SVC. Why the smallest LUN size for at XIV is 17GB where as for the SVC is it 1GB
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compdigit44Asked:
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Gerald ConnollyCommented:
The difference here is that the XIV is a Storage system, whereas the SVC, is a storage virtualisation system.

The XIV presents its storage as LUNs which can be accessed directly, or via the SVC. The SVC puts these (input) LUNs into a pool of available storage and then slices and dices this pool into its own (output) LUNs which can be all of a input LUN, or part of an input LUN, or even a combination of input LUNs

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compdigit44Author Commented:
THanks but why can the XIV only present a lun no smaller than 15 or 17GB
Gerald ConnollyCommented:
Sorry don't know much about the XIV , but Its obviously a design decision based on the way it's RAID engine works - probably due to having a minimum number of spindles restriction
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