'Gets the storage usage object from the Dell backend.
This contains capacity and usage information for the SC.
:returns: The SC storageusage object.'

def get_storage_usage(self):

    storageusage = None
    if (self.ssn is not None):
        r = self.client.get(('StorageCenter/StorageCenter/%s/StorageUsage' % self.ssn))
        if self._check_result(r):
            storageusage = self._get_json(r)
    return storageusage
