Re: ASM Filter Driver Performance

Hi Mladen, nice to hear from you.

Comments inline.

On Thu, Jan 25, 2018 at 5:05 PM, Mladen Gogala <gogala.mladen_at_gmail.com> wrote:

>
>

> - In detail describe machine on which the software was tested. If it
> was tested on a VM, that makes the statement more than suspicious because
> the performance of virtual IO is usually much, much slower than the
> performance of real disk devices.
>
> Details were there for the AWW/EC2 instances.

I have also tested on a local small server (not VM) as mentioned in the article.

Details for it were not included as the performance difference between ASMLib and ASM Filter Driver were consistent regardless of whether run on VM or directly on Hardware.

>
> - Describe the test and the load that was used to establish such an
> incredible difference.
>
> If you are familiar with SLOB , the details are in the article.
( https://kevinclosson.net/slob/ )

>
> - Explain the mechanism which makes ASM Filter Driver so much faster
> than ASMLib.
>
>
Interesting that there would be an expectation for me (or anyone) to be able to explain just what Oracle Developers did to improve their code.

> As I have already written, ASM Filter Driver is very new. Any bugs in the
> driver mechanism can bring your instance, and therefore your database,
> down. Such outlandish claims do not convince me on the merit of using
> filter driver.
>
Outlandish claims?

No claims were made, just results of performance tests.

You are certainly free to ignore them, or even better, run your own performance tests and publish the results.

BTW, there will be more ASM details in presentations at Hotsos and IOUG Collaborate.

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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