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diff --git a/docs/proposal/storage-qpi.rst b/docs/proposal/storage-qpi.rst new file mode 100644 index 00000000..af7c7954 --- /dev/null +++ b/docs/proposal/storage-qpi.rst @@ -0,0 +1,70 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. (c) 2017 ZTE Corp. + + +*********** +Storage QPI +*********** + +The storage QPI gives user an overall score for storage performance. + +The measurement is done by `StorPerf`_. + +.. _StorPerf: https://wiki.opnfv.org/display/storperf + +Baseline +======== + +Baseline is established by testing with a set of work loads: + +- `Queue depth`_ (1, 2, 8) +- `Block size`_ (2KB, 8KB, 16KB) +- `Read write`_ + - sequential read + - sequential write + - random read + - random write + - random mixed read write 70/30 + +.. _Queue depth: http://fio.readthedocs.io/en/latest/fio_man.html#cmdoption-arg-iodepth +.. _Block size: http://fio.readthedocs.io/en/latest/fio_man.html#cmdoption-arg-blocksize +.. _Read write: http://fio.readthedocs.io/en/latest/fio_man.html#cmdoption-arg-readwrite + +Metrics +======= + +- Throughput: data transfer rate +- IOPS: I/O operations per second +- Latency: response time + +Workload Scores +=============== + +For each test run, if an equivalent work load in baseline is available, a score will be calculated by comparing the +result to baseline. + +Section Scores +============== + ++-----------------+--------------------------------------------------------+-----------------------------------------+ +| Section | Detail | Indication | ++=================+========================================================+=========================================+ +| IOPS | Read write I/O Operation per second under steady state | Important for frequent storage access | +| | Workloads : random read/write | such as event sinks | ++-----------------+--------------------------------------------------------+-----------------------------------------+ +| Throughput | Read write data transfer rate under steady state | Important for high throughput services | +| | Workloads: sequential read/write, block size 16KB | such as video server | ++-----------------+--------------------------------------------------------+-----------------------------------------+ +| Latency | Average response latency under steady state | Important for real time applications | +| | Workloads: all | | ++-----------------+--------------------------------------------------------+-----------------------------------------+ + +Section score is the `geometric mean <https://en.wikipedia.org/wiki/Geometric_mean>`_ of all +workload score. + +Storage QPI +=========== + +Storage QPI is the `weighted arithmetic mean <https://en.wikipedia.org/wiki/Weighted_arithmetic_mean>`_ of all section +scores. |