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From: Peter Rabbitson <rabbit@rabbit.us>
Cc: linux-raid@vger.kernel.org
Subject: Speed variation depending on disk position (was: Linux SW RAID: HW Raid Controller/JBOD vs. Multiple PCI-e Cards?)
Date: Sat, 05 May 2007 23:37:12 +0200	[thread overview]
Message-ID: <463CF908.6000602@rabbit.us> (raw)
In-Reply-To: <20070505205456.GA17112@tuatara.stupidest.org>

Chris Wedgwood wrote:
> <snip>
> 
> Also, 'dd performance' varies between the start of a disk and the end.
> Typically you get better performance at the start of the disk so dd
> might not be a very good benchmark here.
> 

Hi,
Sorry for hijacking this thread, but I was actually planning to ask this
very same question. Is the behavior you are describing above
manufacturer dependent or it is pretty much dictated by the general
design of modern drives? I have an array of 4 Maxtor sata drives, and
raw read performance at the end of the disk is 38mb/s compared to 62mb/s
at the beginning.

Thanks

  reply	other threads:[~2007-05-05 21:37 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-05-05 16:33 Linux SW RAID: HW Raid Controller/JBOD vs. Multiple PCI-e Cards? Justin Piszcz
2007-05-05 16:44 ` Bill Davidsen
2007-05-05 17:37 ` Patrik Jonsson
2007-05-05 20:54 ` Chris Wedgwood
2007-05-05 21:37   ` Peter Rabbitson [this message]
2007-05-06  5:02     ` Speed variation depending on disk position Benjamin Davenport
2007-05-06 15:29     ` Speed variation depending on disk position (was: Linux SW RAID: HW Raid Controller/JBOD vs. Multiple PCI-e Cards?) Mark Hahn
2007-05-06 19:39     ` Speed variation depending on disk position Richard Scobie
2007-05-08 13:34       ` Bill Davidsen
2007-05-05 21:18 ` Linux SW RAID: HW Raid Controller/JBOD vs. Multiple PCI-e Cards? Emmanuel Florac
2007-05-05 21:32   ` Justin Piszcz

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