bench-ssd-5 (characteristic of bench-ssd-*) key value hostname bench-ssd-5 cpu_model_name Intel(R) Xeon(R) CPU E3-1220 v5 @ 3.00GHz ram_gb 7.712375640869141 os ['Debian GNU/Linux', '9', 'stretch'] arch x86_64 kernel 4.9.0-8-amd64 read_iops (/home/ccl/bitcoinperf) 2133 write_iops (/home/ccl/bitcoinperf) 705 bench-hdd-3 The only difference, you'll notice, are the much slower disk IO speeds. key value hostname bench-hdd-3 cpu_model_name Intel(R) Xeon(R) CPU E3-1220 v5 @ 3.00GHz ram_gb 7.712368011474609 os ['Debian GNU/Linux', '9', 'stretch'] arch x86_64 kernel 4.9.0-8-amd64 read_iops (/home/ccl/bitcoinperf) 229 write_iops (/home/ccl/bitcoinperf) 77