It's fundamentally objects, but not S3-style objects. It's more NASD/T10 objects, with rich semantics including partial writes and strong consistency. Impleme

It's fundamentally objects, but not S3-style objects. It's more NASD/T10 objects, with rich semantics including partial writes and strong consistency. Implementing block storage on top of this layer (called RADOS) is trivial. Implementing S3-style objects is a bit more work, and implementing a filesystem was downright hard, but both have been done. Disclaimer: I'm a Gluster developer, which isn't quite the same as being a Ceph developer but we do talk to one another. ;)