Comment 4 for bug 607920

Some resources can have different dimensions:

> Total number of vcpus:
Number of cores or cpu cycles? Number of cores is easier, but keep in mind cpu cycles is the way to compare apples to apples. i suggest to add in the future cpu cycles. Some standards like OVF do care about cpu cycles, for example.

> Total amount of RAM
Ok.

> Total amount of volume storage
Several dimensions here:
- total ammount of storage
- maximum volumen size
- total ammount of volumes

> Total number of instances
Ok

> Total number of registered images (this can be large, but just to keep people from doing crazy things)
Does it make sense to control the total size of all the registered images? If stored in a local datacenter can be huge!