Re: Using fio with adjusted parameters for use case "DB"

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On 3/7/23 09:30, Thomas Schneider wrote:
Hello,

I want to benchmark different storage devices with an I/O workload generated by the "real" application: DB.

A typcial command could be:
fio --name=random-writers --ioengine=libaio --iodepth=4 --rw=randwrite --bs=1024 --direct=1 --size=64m --numjobs=2 runtime=120s

The question is regarding parameters size and runtime:
- What value should be used for size? Should this be the same as allocated disk space by DB data files? Or just a (reasonable) portion of this? DB data files could be up to xTB. - Is it advisable to use runtime? If yes, would this somehow contradict to size, means if I use a larger size, then runtime is obviously longer.


The documentation for runtime is here:

https://fio.readthedocs.io/en/latest/fio_doc.html#cmdoption-arg-runtime

Fio will write within the LBAs bounded by offset and size and stop when it has touched all the LBAs or when runtime is attained. Run some experiments with --debug=io to better understand fio's behavior.

Also take a look at the example job files for help:

https://github.com/axboe/fio/tree/master/examples

Vincent




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