hey guys.
wondering if anyone else has done some solid benchmarking of jewel vs luminous, in particular on the same cluster that has been upgraded (same cluster, client and config).
we have recently upgraded a cluster from 10.2.9 to 12.2.0, and unfortunately i only captured results from a single fio (librbd) run with a few jobs in it before upgrading. i have run the same fio jobfile many times at different times of the day since upgrading, and been unable to produce a close match to the pre-upgrade (jewel) run from the same client. one particular job is significantly slower (4M block size, iodepth=1, seq read), up to 10x in one run.
i realise i havent supplied much detail and it could be dozens of things, but i just wanted to see if anyone else had done more quantitative benchmarking or had similar experiences. keep in mind all we changed was daemons were restarted to use luminous code, everything else exactly the same. granted it is possible that some/all osds had some runtime config injected that differs from now, but i'm fairly confident this is not the case as they were recently restarted (on jewel code) after OS upgrades.
cheers,
Raf
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