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Glance image to base image mapping ?

Would like to know where exactly is the mapping done between the images uploaded to Glance and the corresponding image file that is downloaded to compute nodes under "/var/lib/nova/images/_base" when nova boot <> is used to instantiate a VM. I could see that under _base dir, there is a raw disk file getting created with HEX # as file names. And this image is used as base line image for all the new VM instances.

The info that I'm looking for is, how the the glance uploaded image and this _base image's are mapped when ever a new nova VM in launched so that only the first time the _base/ image is downloaded and later on its reused.