There are a number of available tools and approaches for benchmarking S3 performance in Ceph. Benchmarking reliably and sensibly gets more challenging as you scale out storage clusters, gateways, and benchmarking drivers. In this talk I’ll go over some of the benchmarking tools we’ve used in recent months, talk about our focus around COSBench, and some of the approaches and steps we took to improve the state of COSBench for Ceph benchmarking, both in COSBench itself and with helper tools.