raid1 - optimization

hi guys, i another thread i read about SNIA DDF Technical Position v2.0
could we implement RAID-1E, for sequencial/random read speedup?
http://www.snia.org/tech_activities/standards/curr_standards /ddf/SNIA_DDF_Technical_Position_v2.0.pdf
after that, could we implement some tweaks on read balance (there's
another thread just for it)

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Roberto Spadim
Spadim Technology / SPAEmpresarial
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Re: raid1 - optimization

On 03/02/2011 14:37, Roberto Spadim wrote:
> hi guys, i another thread i read about SNIA DDF Technical Position v2.0
> could we implement RAID-1E, for sequencial/random read speedup?
> http://www.snia.org/tech_activities/standards/curr_standards /ddf/SNIA_DDF_Technical_Position_v2.0.pdf
> after that, could we implement some tweaks on read balance (there's
> another thread just for it)

Those RAID-1E layouts look to me like what's implemented in md RAID as
RAID-10 with near and offset layouts.

As discussed frequently here, md RAID-10 also has a far layout which can
provide slightly faster than RAID-0 throughput for sequential reading
with slightly slower than RAID-1 throughput for sequential writing.
Please see some of the benchmarks that have also been referred to on
this list in the last couple of days.

Cheers,

John.

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Re: raid1 - optimization

nice =3D] i will test it (i think that=B4s raid-10 with offset layout i=
s
raid 1e on snia document)
the second point where could i find developers to change a bit current
read_balance of raid1 and raid10?

2011/2/3 John Robinson :
> On 03/02/2011 14:37, Roberto Spadim wrote:
>>
>> hi guys, i another thread i read about SNIA DDF Technical Position v=
2.0
>> could we implement RAID-1E, for sequencial/random read speedup?
>>
>> http://www.snia.org/tech_activities/standards/curr_standards /ddf/SNI=
A_DDF_Technical_Position_v2.0.pdf
>> after that, could we implement some tweaks on read balance (there's
>> another thread just for it)
>
> Those RAID-1E layouts look to me like what's implemented in md RAID a=
s
> RAID-10 with near and offset layouts.
>
> As discussed frequently here, md RAID-10 also has a far layout which =
can
> provide slightly faster than RAID-0 throughput for sequential reading=
with
> slightly slower than RAID-1 throughput for sequential writing. Please=
see
> some of the benchmarks that have also been referred to on this list i=
n the
> last couple of days.
>
> Cheers,
>
> John.
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-raid"=
in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at =A0http://vger.kernel.org/majordomo-info.html
>



--=20
Roberto Spadim
Spadim Technology / SPAEmpresarial
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Re: raid1 - optimization

On Thu, Feb 03, 2011 at 02:56:49PM +0000, John Robinson wrote:
> On 03/02/2011 14:37, Roberto Spadim wrote:
> >hi guys, i another thread i read about SNIA DDF Technical Position v2.0
> >could we implement RAID-1E, for sequencial/random read speedup?
> >http://www.snia.org/tech_activities/standards/curr_standard s/ddf/SNIA_DDF_Technical_Position_v2.0.pdf
> >after that, could we implement some tweaks on read balance (there's
> >another thread just for it)
>
> Those RAID-1E layouts look to me like what's implemented in md RAID as
> RAID-10 with near and offset layouts.
>
> As discussed frequently here, md RAID-10 also has a far layout which can
> provide slightly faster than RAID-0 throughput for sequential reading
> with slightly slower than RAID-1 throughput for sequential writing.
> Please see some of the benchmarks that have also been referred to on
> this list in the last couple of days.

I have written SNIA over a year ago on raid10,f2 to have it
to be a standardized layout too, but without any response.

Best regards
Keld
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