Rackspace has [30GB compute nodes][1]. If you've got these nodes on your
account and try to do a flavor.cores you an exception like:
```
TypeError: nil can't be coerced into Fixnum
from /Users/philkates/.rvm/gems/ruby-1.9.3-p0/gems/fog-1.1.2/lib/fog/rackspace/models/compute/flavor.rb:37:in `*'
from /Users/philkates/.rvm/gems/ruby-1.9.3-p0/gems/fog-1.1.2/lib/fog/rackspace/models/compute/flavor.rb:37:in `cores'
from (irb):6:in `<main>'
from ./bin/fog:52:in `block in <main>'
from ./bin/fog:52:in `catch'
from ./bin/fog:52:in `<main>'
```
This is my incredibly simplistic fix.
[1]: http://www.rackspace.com/cloud/cloud_hosting_products/servers/pricing/
