Is it possible to run more than one instance of MongoDB in Azure? I need (in the future) partition database to many node.
You can run multiple instances if you use a replica set, as you can then use internal endpoints for inter-node communication. If you only have standalone instances, they won't be able to communicate with each other and won't share data.
I've been presenting this at various Mongodb conferences (DC, Silicon Valley), and you can watch the Silicon Valley video recording of my presentation here.