시스템 소프트웨어 및 구조 연구실

NVMeVirt is a virtual NVMe SSD emulator implemented as a Linux kernel module. NVMeVirt consists of PCIe device emulator, NVMe controller emulator, and various storage backends including but not limited to NVM (Non-Volatile Memory) SSD, Conventional SSD, ZNS (Zoned NameSpace) SSD, and KV (Key-Value) SSD. NVMeVirt opens up a new opportunity to design highly intelligent storage devices over the NVMe interface. The management firmware inside of the SSD is usually called the Flash Translation Layer (FTL). The FTL plays an important role in determining the performance and reliability of the SSD. We are working on following research projects related to FTLs. We are actively participating in the OpenSSD Project, which is an initiative to promote research and education on the recent SSD technology by providing easy access to OpenSSD platforms. We are also interested in building ecosystem around the OpenChannel SSD, based on the latest Cosmos+ OpenSSD platform. The storage device has remained dumb for the past several decades. Now it’s time to make it smarter. We are conducting several researches toward intelligent SSD-based storage systems. ForestDB is a key-value storage engine we have developed in collaboration with Couchbase Inc. ForestDB uses a new hybrid indexing scheme called HB+Trie which allows for efficient indexing and retrieval of arbitrary length string keys. We are currently working on a version of ForestDB called ForestDB-raw that works on the raw block device. We plan to use ForestDB-raw in implementing a user-level file system for NVMeDirect and a storage engine for Ceph distributed storage system. Ceph is a scalable, reliable and high-performance storage solution that is widely used in the cloud computing environment. Our goal is to develop a new storage engine