Re: ASM Filter Driver Performance

The numbers are extremelly suspicious. 20% of improvement means that there is a problem with the methodology. It is simply not possible that the disk drivers are responsible for such a performance increase. If that actually is the case, then there is an inescapable conclusion about the quality of RAC as a product. However, ASMLib provided roughly the same performance as raw disk devices, which are not Oracle software. I am waiting for Kevin Closson to comment on this one.

Mladen Gogala

On Jan 25, 2018 8:08 PM, "Stefan Knecht" <knecht.stefan_at_gmail.com> wrote:

> Very nice write-up Jared!
>
> It just seems very odd to me. Not because of your findings per se. But
> this is an Oracle product. If they did something to optimize performance,
> they must've been aware of this when they released the product. And if
> Oracle does something that makes something else 20-30% faster, you'd think
> they'd make a whole lot of noise about it :)
>
> Could they be using a different syscall that does some implicit heuristic
> based caching or something else? And what we're seeing is actually a new
> Linux feature and not an Oracle feature?
>
> Did you look at strace at all of any of those tests?
>
> Stefan
>
>
>
> On Fri, Jan 26, 2018 at 3:47 AM, Jared Still <jkstill_at_gmail.com> wrote:
>
>>
>> Hello,
>>
>> Some of you may find this interesting.
>>
>> As much of a pain as it is to setup ASM Filter Driver 12.2, I have now
>> done so several times just so I could see how it works and compare it to
>> udev and ASMLib.
>>
>> What I found was not what I was looking for: 20% better IO performance
>> over ASMLib.
>>
>> https://blog.pythian.com/improve-oracle-performance-asm-filter-driver/
>>
>>
>> Jared Still
>> Certifiable Oracle DBA and Part Time Perl Evangelist
>> Principal Consultant at Pythian
>> Pythian Blog http://www.pythian.com/blog/author/still/
>> Github: https://github.com/jkstill
>>
>>
>>
>
>
> --
> //
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