Re: [Xen-users] Network based storage - NBD/AoE/iSCSI other?

[Tom Mornini <tmornini@xxxxxxxxxxxxxx>]

On Oct 2, 2006, at 7:49 AM, John Madden wrote:

> > > And their performance numbers are relatively terrible, so you
> > > should be able to do much better by building it on your own.   
> > > (Unless
> > > the bad performance numbers are due to AoE itself, which I somewhat
> > > doubt, but regardless, I was able to do about 30% better with  
> > > iSCSI.)
> > In terms of what? We're getting a very high IOPS rate, and nearly
> > saturating gigabit ethernet.
> (Saturating the link is fine as long as your performance is good as
> well.)  Anyway, the numbers I've read from them show something in the
> neighborhood of really terrible:
> http://www.linuxjournal.com/article/8149 -- 23.58MB/s reads.  I'd  
> expect
> that performance out of a single ATA disk. IOPS is obviously something
> different, but I don't believe that article mentions it.
That article is 18 months old.

That is their older box, which had 10 drives, 10 100Mb ethernet cards  
and
no built-in RAID functionality.

It is completely and totally irrelevant in this discussion

iSCSI is pointless unless you need to traverse a router and will be  
slower
than AoE.

--
-- Tom Mornini


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