Hello, I need to test a storage device adjusting the % of the write workload that can be compressed. I've learnt how to use buffer_compress_percentage=70 refill_buffers buffer_pattern When you set buffer_compress_percentage to a job, or to global, then 100% of the write workload will be compressed (at 70% rate ,in this example) . What I'd like to understand is if there's a way to tune the % of the write workload that will be compressed. Ideally FIO should send 70% writes compressible (at 10% compress rate) and 30% not compressible (or 0% compress rate) I could create 7 jobs with buffer_compress_percentage and 3 jobs without, but I need to have the 70/30 ratio in a single job/thread. thanks Michele Pardini