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Date:	Mon, 7 Jul 2008 15:40:10 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	xfs@....sgi.com
cc:	Alan Piszcz <ap@...arrain.com>
Subject: Re: 12 Veliciraptors again w/x4 card (1.1gbytes/sec aggregate
 read)!



On Mon, 7 Jul 2008, Justin Piszcz wrote:

>
>
> On Mon, 7 Jul 2008, Justin Piszcz wrote:
>
>> 
>> 
>> On Mon, 7 Jul 2008, Justin Piszcz wrote:
>> 
>>> Each PCI-e x1 card has 1 veliciraptor on it now.
>>> Got an x4 card wit 4 sata ports:
>>> 
>>> Not quite the > 1 gbyte/sec I was hoping for in regards to the reads
>>> but pretty close!
>> 
>> Going to remove one of the drives from the x1 card and put it on the x4
>> card instead, then I will use all 4 SATA ports on the x4 and hopefully get
>> better bw.
>> 
>
> Four drives on the x4 card, MAX bandwidth for every disk.
>
> p34:~# dd if=/dev/sdi of=/dev/null bs=1M &
> [1] 4720
> p34:~# dd if=/dev/sdj of=/dev/null bs=1M &
> [2] 4721
> p34:~# dd if=/dev/sdk of=/dev/null bs=1M &
> [3] 4722
> p34:~# dd if=/dev/sdl of=/dev/null bs=1M &
> [4] 4723
> p34:~#
>
> 120MiB/s per each one!
>
> Re-running dd test with all 12 disks:
>
> 1.1 gigabytes per second read!
>

bonnie++ benchmarks:

http://home.comcast.net/~jpiszcz/20080707/veliciraptors_with_x4.html

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