From: "Keld Jørn Simonsen" <keld@keldix.com>
To: John Robinson <john.robinson@anonymous.org.uk>
Cc: Roberto Spadim <roberto@spadim.com.br>,
Linux-RAID <linux-raid@vger.kernel.org>
Subject: Re: raid1 - optimization
Date: Thu, 3 Feb 2011 16:45:40 +0100 [thread overview]
Message-ID: <20110203154540.GB27356@www2.open-std.org> (raw)
In-Reply-To: <4D4AC231.8010900@anonymous.org.uk>
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_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.
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
prev parent reply other threads:[~2011-02-03 15:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-03 14:37 raid1 - optimization Roberto Spadim
2011-02-03 14:56 ` John Robinson
2011-02-03 15:20 ` Roberto Spadim
2011-02-03 15:45 ` Keld Jørn Simonsen [this message]
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