linux-kernel - Re: Linux MD RAID 5 Benchmarks Across (3 to 10) 300 Gigabyte Veliciraptors

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Message-ID: <4850354A.8090503@tmr.com>
Date:	Wed, 11 Jun 2008 16:27:54 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
CC:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	xfs@....sgi.com, Alan Piszcz <ap@...arrain.com>
Subject: Re: Linux MD RAID 5 Benchmarks Across (3 to 10) 300 Gigabyte Veliciraptors

Justin Piszcz wrote:
> First, the original benchmarks with 6-SATA drives with fixed 
> formatting, using
> right justification and the same decimal point precision throughout:
> http://home.comcast.net/~jpiszcz/20080607/raid-benchmarks-decimal-fix-and-right-justified/disks.html 
>
>
> Now for for veliciraptors! Ever wonder what kind of speed is possible 
> with
> 3 disk, 4,5,6,7,8,9,10-disk RAID5s? I ran a loop to find out, each run is
> executed three times and the average is taken of all three runs per 
> each RAID5 disk set.
>
> In short? The 965 no longer does justice with faster drives, a new 
> chipset
> and motherboard are needed. After reading or writing to 4-5 veliciraptors
> it saturates the bus/965 chipset.

This is very interesting, but a 16GB chunk size bears no relationship to 
anything I would run in the real world, and I suspect most people are in 
the same category.

-- 
Bill Davidsen <davidsen@....com>
  "Woe unto the statesman who makes war without a reason that will still
  be valid when the war is over..." Otto von Bismark 


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