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+ [sahara] because they are primary consumer of the BDD.

John,
Thanks for the answer. My comments are inline.

Regards,
Ivan Kolodyazhny,
http://blog.e0ne.info/

On Mon, Sep 19, 2016 at 4:41 PM, John Griffith <john.griffith8 at gmail.com>
wrote:

>
>
> On Mon, Sep 19, 2016 at 4:43 AM, Ivan Kolodyazhny <e0ne at e0ne.info> wrote:
>
>> Hi team,
>>
>> We did some performance tests [1] 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
>> driver.
>>
>> Tests were executed on following configurations:
>>
>>    - LVM +TGT target
>>    - LVM+LocalTarget: PoC based on [2] spec
>>    - LVM+LIO
>>    - Block Device Driver.
>>
>>
>> Feel free to ask question if any about our testing infrastructure,
>> environment, etc.
>>
>>
>> [1] https://docs.google.com/spreadsheets/d/1qS_ClylqdbtbrVSvwbbD
>> pdWNf2lZPR_ndtW6n54GJX0/edit?usp=sharing
>> [2] https://review.openstack.org/#/c/247880/
>>
>> Regards,
>> Ivan Kolodyazhny,
>> http://blog.e0ne.info/
>>
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>>
>> ​Thanks Ivan, so I'd like to propose we (the Cinder team) discuss a few
> things (again):
>
> 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.
>
What about Local Target? Does it make sense to implement it instead BDD?

>
> 2. Consider getting buy off to move the default implementation to use the
> LIO driver and consider deprecating the TGT driver
>
+1. Let's bring this topic for the next weekly meeting.



>
> 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.
>
> Thanks,
> John​
>
>
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