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Date: Fri, 30 Oct 2009 10:15:51 -0700
From: Andrew Sharp <andy.sharp@lsi.com>
To: "Johnson, Dave" <Dave.Johnson@lsi.com>
Cc: "Hernandez, Jairo (Glasshouse)" <jhernandez@css.glasshouse.com>,
 DL-ONStor-cstech <dl-cstech@lsi.com>
Subject: Re: case 13521 Speed Computing -- Mirror performance question
Message-ID: <20091030101551.3d46b9f8@ripper.onstor.net>
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Well, 20MiB/s is obviously only for gigabit, hence a crossover cable
would not be used.  That would only be for 100Mb links.

On Fri, 30 Oct 2009 11:08:32 -0600 "Johnson, Dave"
<Dave.Johnson@lsi.com> wrote:

> If code has changed since 3.2 to limit local mirror speed, then I
> would go with Rich's numbers below.
> 
> However, the 20MB/s limit on DMIP is likely immaterial since I've
> never seen more than 7MB/s with a cross over cable connected between
> systems but I can only offer this anecdotal evidence.
> 
> -=dave
> 
> From: LaReau, Rich [mailto:Rich.LaReau@lsi.com]
> Sent: Friday, October 30, 2009 9:56 AM
> To: Hernandez, Jairo (Glasshouse); 'dl-cstech'
> Subject: RE: case 13521 Speed Computing -- Mirror performance question
> 
> Hi Jairo,
> 
> I am not aware of a white paper on this.   This internal Wiki is from
> Sept. last year, and I am sure is current:
> 
> http://wiki.onstor.net/wiki/DMIP_best_practices
> 
> Max thruput of DMIP is 20MB/s while local mirror would be 40-60MB/s.
> See SAG Chapter 13 for the detailed steps of the local baseline
> transfer.
> 
> Rich
> 
> 
> From: Jairo Hernandez [mailto:jhernandez@css.glasshouse.com]
> Sent: Friday, October 30, 2009 9:50 AM
> To: 'dl-cstech'
> Subject: case 13521 Speed Computing -- Mirror performance question
> 
> Hello,
> 
> Is there a general performance mirror example/document for local and
> DMIP that someone has written up? He just needs a basline example
> with performance numbers, that doesn't even need to fit his
> environment(i.e. number of disks, raid type, etc).
> 
> thanks,
> 
> jairo
