[dave_ops]

When I internalized this trend ~3 years ago, it's what spurred my interest in distributed storage systems across machines, racks, and datacenters, that are only memory backed.

[mprovost]

Any examples of such a system?

[nostrademons]

All the major webscale systems - Google, Facebook, Microsoft's cloud services.

At a lower scale, there are also services like Hacker News, Plenty of Fish, and Mailinator that serve out of RAM on a single box.