Robustness in the Salus scalable block store

  Yang Wang, Lakshmi Ganesh, Manos Kaprtisos, Jeevitha Kirubanandam
    Prince Mahajan, Zuocheng Ren, Mark Silberstein, Lorenzo Alvisi
		   Mike Dahlin, and Michael Walfish

This paper describes Salus, a scalable block store optimized for
robustness. Salus is designed to remain safe (i.e., its blocks are
consistent and durable) and live (i.e., its blocks are available)
despite frequent crash and omission failures as well as occasional
comission failures by its servers. One might worry that such increased
protection would come at the cost of performance or scalability, but
Salus often actually outperforms HBase (the codebase from which Salus
descends.) For example, Salus's active replication allows it to halve
network bandwidth while increasing aggregate write throughput by a
factor of 1.81 compared to HBase in a well-provisioned system.