how to get stoarge capacity used for vdc

Hi

we were getting the total and used capacity in vco 4.2.0

vdc.storageCapacity.allocated;

vdc.storageCapacity.used; 

but this code is not working in vco 5.1

there is new concept in 5.1 of storage profile that gives us the total allocated storage like

vdc.getStorageProfiles()[0].limit

but how we could find the allocated used capacity?

thank