Let's say that I have a need to have a single-name space scale to multi-petabyte object store with a file system-like wrapper. What is currently out there that supports the following:

1. Single name space that can take 1B files.
2. Support for multiple entry points using NFS
3. At least node level replication ( preferably node and file level replication )
4. Online software upgrades
5. No "magic sauce" on the storage layer

The following has been evaluated:

Gluster & Lustre - just ick - fundamental lack of understanding of why online upgrades are mandatory.

OneFS - we have it. It is smelling more and more like it hides a dead body under the hood.

Other than MapR and zfs am I missing anything?

P.S. Oh yes, I keep forgetting that the forums are for people to discuss if 2TB drive actually stores 2TB info. May bad. Seriously though - how the heck can "meets the following requirements" can be considered a "debate"?

P.P.S. I did not throw an idiotic insult - i pointed out that this is actually an interesting question compared to a conversation about storage capacity of a 2TB hard drive. It is not a question of what works better - it is a question that asks did I miss any of the products that currently exist which fit the criteria where criteria is clearly outline. I got one answer below which included something that I have not looked at in a long time which looks quite a bit grown up compared to the time I briefly look at it before.