From: Wolfgang Denk <wd@denx.de>
To: stefan.huebner@stud.tu-ilmenau.de
Cc: linux-raid@vger.kernel.org
Subject: Re: Optimize RAID0 for max IOPS?
Date: Wed, 19 Jan 2011 20:21:04 +0100 [thread overview]
Message-ID: <20110119192104.1FA92D30267@gemini.denx.de> (raw)
In-Reply-To: <4D361F26.3060507@stud.tu-ilmenau.de>
Dear =?ISO-8859-15?Q?Stefan_/*St0fF*/_H=FCbner?=,
In message <4D361F26.3060507@stud.tu-ilmenau.de> you wrote:
>
> [in German:] Schätzelein, Dein Problem sind die Platten, nicht der
> Controller.
>
> [in English:] Dude, the disks are your bottleneck.
...
Maybe we can stop speculations about what might be the cause of the
problems in some setup I do NOT intend to use, and rather discuss the
questions I asked.
> > I will have 4 x 1 TB disks for this setup.
> >
> > The plan is to build a RAID0 from the 4 devices, create a physical
> > volume and a volume group on the resulting /dev/md?, then create 2 or
> > 3 logical volumes that will be used as XFS file systems.
Clarrification: I'll run /dev/md* on the raw disks, without any
partitions on them.
> > My goal is to optimize for maximum number of I/O operations per
> > second. ...
> >
> > Is this a reasonable approach for such a task?
> >
> > Should I do anything different to acchive maximum performance?
> >
> > What are the tunables in this setup? [It seems the usual recipies are
> > more oriented in maximizing the data troughput for large, mostly
> > sequential accesses - I figure that things like increasing read-ahead
> > etc. will not help me much here?]
So can anybody help answering these questions:
- are there any special options when creating the RAID0 to make it
perform faster for such a use case?
- are there other tunables, any special MD / LVM / file system /
read ahead / buffer cache / ... parameters to look for?
Thanks.
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
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next prev parent reply other threads:[~2011-01-19 19:21 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-18 21:01 Optimize RAID0 for max IOPS? Wolfgang Denk
2011-01-18 22:18 ` Roberto Spadim
2011-01-19 7:04 ` Wolfgang Denk
2011-01-18 23:15 ` Stefan /*St0fF*/ Hübner
2011-01-19 0:05 ` Roberto Spadim
2011-01-19 7:11 ` Wolfgang Denk
2011-01-19 8:18 ` Stefan /*St0fF*/ Hübner
2011-01-19 8:29 ` Jaap Crezee
2011-01-19 9:32 ` Jan Kasprzak
2011-01-19 7:10 ` Wolfgang Denk
2011-01-19 19:21 ` Wolfgang Denk [this message]
2011-01-19 19:50 ` Roberto Spadim
2011-01-19 22:36 ` Stefan /*St0fF*/ Hübner
2011-01-19 23:09 ` Roberto Spadim
2011-01-19 23:18 ` Roberto Spadim
2011-01-20 2:48 ` Keld Jørn Simonsen
2011-01-20 3:53 ` Roberto Spadim
2011-01-21 19:34 ` Wolfgang Denk
2011-01-21 20:03 ` Roberto Spadim
2011-01-21 20:04 ` Roberto Spadim
2011-01-24 14:40 ` CoolCold
2011-01-24 15:25 ` Justin Piszcz
2011-01-24 20:48 ` Wolfgang Denk
2011-01-24 21:57 ` Wolfgang Denk
2011-01-24 23:03 ` Dave Chinner
2011-01-25 7:39 ` Emmanuel Florac
2011-01-25 8:36 ` Dave Chinner
2011-01-25 12:45 ` Wolfgang Denk
2011-01-25 12:51 ` Emmanuel Florac
2011-01-24 20:43 ` Wolfgang Denk
2011-01-25 17:10 ` Christoph Hellwig
2011-01-25 18:41 ` Wolfgang Denk
2011-01-25 21:35 ` Christoph Hellwig
2011-01-26 7:16 ` Wolfgang Denk
2011-01-26 8:32 ` Stan Hoeppner
2011-01-26 8:42 ` Wolfgang Denk
2011-01-26 9:38 ` Christoph Hellwig
2011-01-26 9:41 ` CoolCold
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