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

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Message-ID: <alpine.DEB.1.10.0806111647360.18136@p34.internal.lan>
Date:	Wed, 11 Jun 2008 16:48:18 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Bill Davidsen <davidsen@....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



On Wed, 11 Jun 2008, Bill Davidsen wrote:

> 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.

I based my bonnie++ test on:
http://everything2.org/?node_id=1479435

So I could compare to his results.

I use a 1024k (1MiB) with 16384 stripe, this offered the best overall 
read/write/rewrite performance AFAIK.

Justin.
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