Expected formats of memory and storage parameters in compute attributes for hosts differ across compute resources. Also the parameter names are different:

Libvirt

memory:  memory (integer, in bytes)
storage: capacity (string, eg 10G)

oVirt

memory:  memory (integer, in bytes)
storage: size_gb (integer)

VMware

memory:  memory_mb (integer)
storage: size_gb (integer)

We should ideally provide consistent way of setting the attributes and convert them into a format required by Fog internally.