The CASE of FEMU: Cheap, Accurate, Scalable and Extensible Flash Emulator


Huaicheng Li, Mingzhe Hao, and Michael Hao Tong, University of Chicago; Swaminatahan Sundararaman, Parallel Machines; Matias Bjørling, CNEX Labs; Haryadi S. Gunawi, University of Chicago


We present FEMU, a QEMU-based flash emulator for fostering future full-stack software/hardware SSD research, with the following four "CASE" benefits. FEMU is cheap ($0) as it will be an open-sourced software; FEMU is relatively accurate, with only 0.5-38% variance from OpenChannel SSD in our tests; FEMU is scalable, upon our optimized QEMU stack, to support up to 32 parallel channels/chips without unintended queueing delays; FEMU is extensible, enabling various types of SSD research, such as internal-SSD, kernel-only and split-level research on it.

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@inproceedings {210518,
author = {Huaicheng Li and Mingzhe Hao and Michael Hao Tong and Swaminathan Sundararaman and Matias Bj{\o}rling and Haryadi S. Gunawi},
title = {The {CASE} of {FEMU}: Cheap, Accurate, Scalable and Extensible Flash Emulator},
booktitle = {16th USENIX Conference on File and Storage Technologies (FAST 18)},
year = {2018},
isbn = {978-1-931971-42-3},
address = {Oakland, CA},
pages = {83--90},
url = {},
publisher = {USENIX Association},
month = feb