Thick Eager zeroed disks space occupation at Storage end.

Dear Friends,

I came across a scenario regarding thick Eager zeroed disk space occupation.

When we provision 10 GB of thick eager zeroed disk to an VM from Empty Datastore. the space consumption at storage end still says 0

When we provision 10 GB of thick eager zeroed disk to an VM from Empty Datastore. the space consumption at storage end still says 10 GB.

I have downloaded 10 GB of Lazy zeroed disk to my local machine, size of the file is 10 GB. How come a file size at vSphere level stayed 10 GB but the storage consumption 0.

By the way we are using EMC symetrix storage box