linux-kernel - Re: Supermicro X8DTH-6: Only ~250MiB/s from RAID<->RAID over 10GbE?

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Message-ID: <20110205220621.GB17347@gallifrey>
Date:	Sat, 5 Feb 2011 22:06:21 +0000
From:	"Dr. David Alan Gilbert" <linux@...blig.org>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	Emmanuel Florac <eflorac@...ellique.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-net@...r.kernel.org, Alan Piszcz <ap@...arrain.com>
Subject: Re: Supermicro X8DTH-6: Only ~250MiB/s from RAID<->RAID over 10GbE?

* Justin Piszcz (jpiszcz@...idpixels.com) wrote:
>
>
> On Sat, 5 Feb 2011, Emmanuel Florac wrote:
>
>> Le Sat, 5 Feb 2011 14:35:52 -0500 (EST) vous écriviez:
>>
>
> To respond to everyone:
>
>> Did you try launching 4 simultaneous cp operations over nfs to get to  
>> 1.2 GB/s?
>>  I've witnessed single stream copy performance with Samba being less than
>> maximum due to Samba limitations.  Running multiple copy ops in parallel then
>> usually saturates the pipe.
>
>
> I tried 4 simultaenous cp's and there was little change, 250-320MiB/s.

So I think you've said network benchmarks are OK, disc benchmarks are OK, but 
a copy over the network is slow.

What happens if you run a disc benchmark at the same time as a network benchmark;
even though the two aren't related? Can you keep the disc busy writing even when
the network is being pushed?

Dave
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
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