I don't have any direct data about Clustra but I read the Hypra/Clustra book[1] a while ago. It uses a tightly coupled scheme of parallel hardware, software an

I don't have any direct data about Clustra but I read the Hypra/Clustra book[1] a while ago. It uses a tightly coupled scheme of parallel hardware, software and networking to provide high availability. Scaling that sort of system will cost you a lot more than running H-Store on a cluster of cheap boxes. [1] - http://books.google.com/books?id=KH_kfSsMu80C&printsec=frontcover&dq=HyPra+database&source=gbs_summary_s&cad=0 http://books.google.com/books?id=KH_kfSsMu80C&printsec=f...