Andrey Kuzmin wrote:
Well, I'm more accustomed to  "sequential vs. random", but YMMW.

As to 67000 512 byte writes (this sounds suspiciously close to 32Mb fitting into cache), did you have write-back enabled?


It's a sustained number, so it shouldn't matter.

Regards,
Andrey



On Fri, Jun 11, 2010 at 12:03 AM, Arne Jansen <sensi...@gmx.net <mailto:sensi...@gmx.net>> wrote:

    Andrey Kuzmin wrote:

        On Thu, Jun 10, 2010 at 11:51 PM, Arne Jansen <sensi...@gmx.net
        <mailto:sensi...@gmx.net> <mailto:sensi...@gmx.net
        <mailto:sensi...@gmx.net>>> wrote:

           Andrey Kuzmin wrote:

               As to your results, it sounds almost too good to be true.
        As Bob
               has pointed out, h/w design targeted hundreds IOPS, and
        it was
               hard to believe it can scale 100x. Fantastic.


           Hundreds IOPS is not quite true, even with hard drives. I
        just tested
           a Hitachi 15k drive and it handles 67000 512 byte linear
        write/s, cache


        Linear? May be sequential?


    Aren't these synonyms? linear as opposed to random.




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