Moving SAN data drive to local storage in Vmware

I need to convert a SAN drive too a local drive on a VMware 2012 R2 Server.  Will this not use up space on the datastore where my vm was created?  And if so where is the savings in space?  Is the best way to do this through the migration tool?
rrsmithabAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you mean move a RAW (RDM) LUN (iSCSI drive) from the SAN to a virtual disk (vmdk) also stored on the SAN ?

If so, it will use the same space on the datastore as a virtual disk (so same space on the SAN), once moved, you can remove the existing LUN to recover space.

The xcopy command or imaging tool will be able to copy the data,
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