On Thu, Jun 10, 2010 at 11:51 PM, Arne Jansen <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? Regards, Andrey > enabled. > > --Arne > > >> Regards, >> Andrey >> >> >> >> >> On Thu, Jun 10, 2010 at 6:06 PM, Robert Milkowski <mi...@task.gda.pl<mailto: >> mi...@task.gda.pl>> wrote: >> >> On 21/10/2009 03:54, Bob Friesenhahn wrote: >> >> >> I would be interested to know how many IOPS an OS like Solaris >> is able to push through a single device interface. The normal >> driver stack is likely limited as to how many IOPS it can >> sustain for a given LUN since the driver stack is optimized for >> high latency devices like disk drives. If you are creating a >> driver stack, the design decisions you make when requests will >> be satisfied in about 12ms would be much different than if >> requests are satisfied in 50us. Limitations of existing >> software stacks are likely reasons why Sun is designing hardware >> with more device interfaces and more independent devices. >> >> >>
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