TorFS: RocksDB Storage Backend for FDP SSDs

TorFS is a plugin that enables RocksDB to access Flexible Data Placement (FDP) SSDs

Getting started

Build

Download RocksDB and TorFS:

git clone git@github.com:facebook/rocksdb.git
cd rocksdb
git clone git@github.com:SamsungDS/TorFS.git plugin/torfs

Install and enable TorFS in micro-bench tool of RocksDB

DEBUG_LEVEL=0 ROCKSDB_PLUGINS=torfs make -j8 db_bench

Testing with db_bench

TorFS supports xNVMe back-end that provides unified interfaces for multiple IO paths.

	io_uring_cmd (character device)	io_uring (block device)	libaio (block device)	SPDK
xNVMe	√	O	O	√
raw	X	X	X	X

• √: Support IO path and data directive
• O: Support IO path only, not data directive
• X: Not support IO path and data directive

./db_bench --benchmarks=<IO pattern> --fs_uri=torfs:<backend>:<dev>?be=<IO path>
e.g.
./db_bench --benchmarks=fillseq --fs_uri=torfs:xnvme:/dev/ng0n1?be=io_uring_cmd

Note

Before version 9.3.1, casting enum WriteLifeTimeHint to uint64 is required to match the parameter type of fcntl()