Re: Optimize RAID0 for max IOPS?

From: Roberto Spadim <roberto@spadim.com.br>
To: Wolfgang Denk <wd@denx.de>
Cc: stefan.huebner@stud.tu-ilmenau.de, linux-raid@vger.kernel.org
Subject: Re: Optimize RAID0 for max IOPS?
Date: Fri, 21 Jan 2011 18:03:52 -0200	[thread overview]
Message-ID: <AANLkTikFbeE=q9i2Bq7FL7+o4u2Qq4vVSnfYbwBorFOV@mail.gmail.com> (raw)
In-Reply-To: <20110121193457.C7719D30268@gemini.denx.de>

=) i know
but, every body tell software is slower, the solution - use hardware
ok
there´s no opensource firmware for raid hardware

i preffer a good software/hardware solution, linux raid is a good
software solution for me =)
but, why not try a opensource project? hehe
what we could do.... a virtual machine :P with only raid and nfs, or
make a dedicated cpu for raid (cpu affinity) and a portion of memory
only for raid cache (today i think raid software don´t have cache, it
shoudn´t, cache is done by linux at filesystem level, i´m right?)

2011/1/21 Wolfgang Denk <wd@denx.de>:
> Dear Roberto,
>
> In message <AANLkTiki_FfRrLtL3dMsrDLXeT8jNO0ndnTNpXk1OXMW@mail.gmail.com> you wrote:
>> a good idea....
>> why not start a opensource raid controller?
>> what we need? a cpu, memory, power supply with battery or capacitor,
>> sas/sata (disk interfaces), pci-express or another (computer
>> interface)
>> it don´t need a operational system, since it will only run one program
>> with some threads (ok a small operational system to implement threads
>> easly)
>>
>> we could use arm, fpga, intel core2duo, atlhon, xeon, or another system...
>
> You could evenuse a processor dedicated for such a job, like a
> PPC440SPe or PPC460SX or similar, which provide hardware-offload
> capabilities for the RAID calculations.  These are even supported by
> drivers in mainline Linux.
>
> But again, thee would not helpo to maximize IOPS - goal for
> optimization has always been maximum sequential troughput only
> (and yes, I know exactly what I'm talking about; guess where the
> aforementioned drivers are coming from).
>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
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> dire need of an ectoplasmic upgrade. :-)              -- Howard Smith
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-- 
Roberto Spadim
Spadim Technology / SPAEmpresarial
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