SDGen: Mimicking Datasets for Content Generation in Storage Benchmarks

Storage system benchmarks either use samples of proprietary data or synthesize artificial data in (such as using zeros or random data). However, many storage systems behave completely differently on such artificial data than they do on real-world data. This is the case with systems that include data reduction techniques, such as compression and/or deduplication.To address this problem, we propose a benchmarking methodology called mimicking and apply it in the domain of data compression. Our methodology is based on that influence the performance of compressors. Then, we use these characterizations to generate new synthetic data that mimics the real one in many aspects of compression. Unlike current solutions that only address the of data, mimicking is flexible enough to also emulate and We show that these properties matter to the system’s performance.In our implementation, called characterizations take at most 2:5KB per data chunk (e.g., 64KB) and can be used to efficiently share benchmarking data in a highly anonymized fashion; sharing it carries few or no privacy concerns. We evaluated our data generator’s accuracy on compressibility and compression times using real-world datasets and multiple compressors (lz4, zlib, bzip2 and lzma). As a proof-of-concept, we integrated as a content generation layer in two popular benchmarks (LinkBench and Impressions).