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.. 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.
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