fio

Sequential read test

$ fio --name=test --rw=read --size=[1G]

$ fio --name=test --rw=randwrite --size=[1G]

$ fio [jobfile.fio]

$ fio --name=test --rw=randrw --rwmixread=[70] --size=[1G]

$ fio --name=test --rw=randread --size=[1G] --lat_percentiles=1

fio [options] [jobfiles...]

fio (Flexible I/O Tester) is a versatile I/O benchmark tool for testing storage performance. It simulates various workload patterns and measures throughput, IOPS, and latency.
The tool supports numerous I/O engines including sync, libaio, io_uring, and network protocols. Job files define complex test scenarios with multiple workloads.
fio is the standard tool for storage benchmarking, used for disk selection, filesystem tuning, and performance validation.

JOBFILES

Job definition files.

Job name.

I/O type: read, write, randread, randwrite, randrw.

Total I/O size.

Block size.

I/O queue depth.

Number of parallel jobs.

Test duration.

Output file.

Display help information.

Results vary with test parameters. May fill disk with test files. Requires understanding of I/O patterns for meaningful results.

fio was created by Jens Axboe, the Linux block layer maintainer. It's the most comprehensive open source storage benchmark, supporting virtually every I/O pattern and storage backend.

dd(1), hdparm(1), ioping(1)