On Thu, 28 Jun 2012, Brian Candler wrote:
On Thu, Jun 28, 2012 at 11:25:20AM +0200, Nicolas Sebrecht wrote:
We excluded ethernet due to searches on the web. It appeared that
ethernet has bad latency.
I read it on the web, it must be true :-)
As I said: don't use 10GE over CAT6/RJ45 (10Gbase-T). That does indeed have
poor latency. As I understand it: in order to get such high data rates over
copper, it has to employ mechanisms similar to DSL lines, like interleaving,
which means 10G has comparable or even higher latency than 1G. Switches
with all 10Gbase-T ports are expensive, only available from a couple of
vendors, and consume a lot of power.
First gen PHYs did suck a LOT of power, but this has changed. With the
next gen PHYs the cost of the 10GBase-T switches has also dropped. They
are now the lowest cost switches out there. I like Arista Networks the
best, but you can get a switch for well under 10K from guys like
Interface Masters.
New servers from SuperMicro and others now offer 10GBase-T native
drastically lowering the cost per port.
I have been working with Intel X520-DA2 NICs and a Netgear XSM7224S switch,
and direct-attach cables (3m Netgear AXC763, 5m Intel)
This all works fine, although with older versions of Linux I had to build
the latest Intel drivers from their website to fix problems with the links
going down every day or two.
Ya, I ran into a odd problem with my X520s where everything worked except
VLANs on bonded interfaces. It took me a full day to figure out it was not
my switch or config, but the stupid ixgbe driver!
<>
Nathan Stratton
nathan at robotics.net
http://www.robotics.net
_______________________________________________
Gluster-users mailing list
[email protected]
http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
