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diff --git a/docs/testing/developer/devguide/storage-qpi.rst b/docs/testing/developer/devguide/storage-qpi.rst new file mode 100644 index 00000000..8a82241e --- /dev/null +++ b/docs/testing/developer/devguide/storage-qpi.rst @@ -0,0 +1,112 @@ +.. 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 + +System Information +================== + +System Information are environmental parameters and factors may affect storage performance: + ++--------------------------------+-------------------------------------------------+-----------------------------------------------------------------------------+ +| System Factors | Detail | Extraction Method | ++--------------------------------+-------------------------------------------------+-----------------------------------------------------------------------------+ +| Ceph Node List | List of nodes which has ceph-osd roles. | Getting from return result of installer node list CLI command. | +| | For example [node-2, node-3, node-4]. | | ++--------------------------------+-------------------------------------------------+-----------------------------------------------------------------------------+ +| Ceph Client RDB Cache Mode | Values: "None", "write-through", "write-back". | Getting from value of "rbd cache" and "rbd cache max dirty" keys | +| | | in client section of ceph configuration; To enable write-through mode, | +| | | set rbd cache max dirty to 0. | ++--------------------------------+-------------------------------------------------+-----------------------------------------------------------------------------+ +| Ceph Client RDB Cache Size | The RBD cache size in bytes. Default is 32 MiB. | Getting from value of "rdb cache size" key in client section | +| | | of ceph configuration. | ++--------------------------------+-------------------------------------------------+-----------------------------------------------------------------------------+ +| Ceph OSD Tier Cache Mode | Values: "None", "Write-back", "Readonly". | Getting from ceph CLI "ceph report" output info. | ++--------------------------------+-------------------------------------------------+-----------------------------------------------------------------------------+ +| Use SSD Backed OSD Cache | Values: "Yes", "No". | Getting from POD description and CEPH CLI "ceph-disk list" output info. | ++--------------------------------+-------------------------------------------------+-----------------------------------------------------------------------------+ +| Use SSD For Journal | Values: "Yes", "No". | Getting from POD description and CEPH CLI "ceph-disk list" output info. | ++--------------------------------+-------------------------------------------------+-----------------------------------------------------------------------------+ +| Ceph Cluster Network Bandwidth | Values: "1G", "10G", "40G". | Getting from physical interface information in POD description, | +| | | "ifconfig" output info on ceph osd node, | +| | | and value of "cluster network" key in global section of ceph configuration. | ++--------------------------------+-------------------------------------------------+-----------------------------------------------------------------------------+ + +Test Condition +============== + ++-----------------------------+------------------------------------------+-------------------------------------------------------------+ +| Test Condition | Detail | Extraction Method | ++-----------------------------+------------------------------------------+-------------------------------------------------------------+ +| Number of Testing VMs | Number of VMs which are created, | It equals the number of Cinder nodes of the SUT. | +| | during running Storperf test case. | | ++-----------------------------+------------------------------------------+-------------------------------------------------------------+ +| Distribution of Testing VMS | Number of VMs on each computer node, | Recording the distribution when runing Storperf test case. | +| | for example [(node-2: 1), (node-3: 2))]. | | ++-----------------------------+------------------------------------------+-------------------------------------------------------------+ + +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. |