Crash Consistency in DRAM-NVM-Disk Hybrid Storage System

NVM is used as a new hierarchy in the storage system, due to its intermediate speed and capacity between DRAM, and its byte granularity. However, consistency problems emerge when we attempt to put DRAM, NVM, and disk together as an efficient whole. In this paper, we discuss the challenging consistency problems faced by heterogeneous storage systems, and propose our solution to the problems. The discussion is based on NVPC as a case study, but can be inspiring and adaptive to all similar heterogeneous storage systems.