fio

4k random read IOPS 4k random read IOPS test; note: --direct=1 bypasses page cache for true device numbers fio --name=randread --filename=/dev/<id> --rw=randread --bs=4k --iodepth=32 --numjobs=4 --runtime=60 --time_based --direct=1 --group_reporting #fio#disk#performance#troubleshooting 4k random write IOPS 4k random write IOPS on a file; note: destroys data if filename is a raw device fio --name=randwrite --filename=/data/testfile --size=4G --rw=randwrite --bs=4k --iodepth=64 --numjobs=4 --runtime=60 --time_based --direct=1 --group_reporting #fio#disk#performance#troubleshooting Sequential throughput Sequential write throughput (MB/s) with large 1M blocks and direct I/O fio --name=seqwrite --filename=/data/testfile --size=10G --rw=write --bs=1M --iodepth=16 --direct=1 --runtime=60 --time_based --group_reporting #fio#disk#performance Single-depth latency probe Pure per-IO latency at iodepth=1; reports p99/p99.9/p99.99 tail latency fio --name=latency --filename=/dev/<id> --rw=randread --bs=4k --iodepth=1 --numjobs=1 --runtime=30 --time_based --direct=1 --percentile_list=99:99.9:99.99 #fio#disk#performance#troubleshooting Mixed 70/30 read-write Realistic mixed workload 70% read / 30% write; closer to OLTP than pure tests fio --name=mixed --filename=/data/testfile --size=8G --rw=randrw --rwmixread=70 --bs=4k --iodepth=32 --numjobs=4 --runtime=120 --time_based --direct=1 --group_reporting #fio#disk#performance