I need to implement a distributed storage system for a set of nodes(devices) connected in a mesh network.

So what basically my design goals are:

1. The storage system should be capable of handling dynamic entry and exit of nodes.
2. Replication (for fault tolerance).

For this i am thinking of using a Distributed file system. Every node could access data in the other nodes in a transparent manner.

Are there some simple, easily pluggable opensource implementations?

Thanks for your thoughts!