I am developing an application using nodejs and mongodb. I came across Openshift for hosting, they provides 3 free gears each with 512 ram and 1 GB disk space.

MongoDB is in the form of cartridge for Openshift applications, so i am not sure, if i install a MongoDB cartridge for my nodejs application, how much data size will it be allotted for MongoDB . 

a) Does it limit to 1GB 
b) MongoDB data-size= 1GB - (NodeJS APP space) 
c) or can i have it as a separate gear for MongoDB and access in my application ?

Also does Openshift allow to access external cloud datastore like mongoHQ or cloudant

node.js mongodb openshift
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