Re: [Xen-users] Shared Storage

[Eduardo Bragatto <eduardo@xxxxxxxxxxxx>]

On Apr 26, 2011, at 6:37 PM, Eduardo Bragatto wrote:

> > On 04/26/2011 04:31 PM, Javier Guerra Giraldez wrote:
> > Some good summary numbers are near the bottom here (PDF):
> >
> > http://www.google.com/url?sa=t&source=web&cd=1&ved=0CCIQFjAA&url=http%3A%2F%2Fwww.rainiersolutions.com%2FRainierLibrary%2FiSCSI%2520SAN%2520Performance.pdf&rct=j&q=iscsi%20throughput%20gigabit&ei=NC63TaGhI8n50gGJl4kF&usg=AFQjCNGqiaj31yc3XYue97OL9KpPyo_zDg&cad=rja
> >
> > With a MTU of 1500, they're claiming 94.93% payload.  On GbE, I  
> > don't believe I've seen more than ~100MB/s on any protocol, hence  
> > my estimate of 20% overhead.
> > John
> In sequential writes I get nearly all the 125MB/s using iSCSI on  
> BCM5709 without the iSCSI Offload module enabled (better yet, module  
> is loaded but reporting my cards do not support it, although they do).
> It fluctuates from normally 120MB/s to rarely 125MB/s.
Oooops, my bad. I decided to double check after I posted and after  
doing a 10GB sequential write, I realized the software I used to test  
was using 10^9 for GB instead of 1024^3, resulting in higher rates  
than in reality.
After redoing the math using the correct amount of data transfered, I  
got to 113MB/s which is what the document defines as the maximum  
theoretical throughput.
Best regards,
Eduardo

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