On Mon, Sep 19, 2016 at 4:43 AM, Ivan Kolodyazhny <e...@e0ne.info> wrote:
> Hi team,
> We did some performance tests  for LVM and BDD drivers. All tests were
> executed on real hardware with OpenStack Mitaka release. Unfortunately, we
> didn't have enough time to execute all tests and compare results. We used
> Sahara/Hadoop cluster with TestDFSIO and others tests.
> All tests were executed on the same hardware and OpenStack release. Only
> difference were in cinder.conf to enable needed backend and/or target
> Tests were executed on following configurations:
> - LVM +TGT target
> - LVM+LocalTarget: PoC based on  spec
> - LVM+LIO
> - Block Device Driver.
> Feel free to ask question if any about our testing infrastructure,
> environment, etc.
>  https://docs.google.com/spreadsheets/d/1qS_
>  https://review.openstack.org/#/c/247880/
> Ivan Kolodyazhny,
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> Thanks Ivan, so I'd like to propose we (the Cinder team) discuss a few
1. Deprecate the BDD driver
Based on the data here LVM+LIO the delta in performance (with the
exception of the Terravalidate run against 3TB) doesn't seem significant
enough to warrant maintaining an additional driver that has only a subset
of features implemented. It would be good to understand why that
particular test has such a significant peformance gap.
2. Consider getting buy off to move the default implementation to use the
LIO driver and consider deprecating the TGT driver
I realize this probably isn't a sufficient enough data set to make those
two decisions but I think it's at least enough to have a more informed
discussion this time.
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