Fw: networking questions

Dennis Gilmore dennis at ausil.us
Thu Mar 22 19:03:41 UTC 2012

Hash: SHA1

Hey all i asked a couple of questions of calxeda about networking on
thier arm hardware im forwarding on the attached response. if we have
more questions we can ask.


Inicio del mensaje redirigido:

Fecha: Wed, 21 Mar 2012 18:38:26 -0500
Desde: Mark Langsdorf <mark.langsdorf at calxeda.com>
Para: Dennis Gilmore <dennis at ausil.us>
Asunto: Re: networking questions

On 03/20/2012 04:04 PM, Dennis Gilmore wrote:
> Hi Mark,
> finally sorted out email. a corrupt imap cache caused claws to sigbus,
> always fun.  so to the networking question.
> in fedora infrastructure today we have 4 different vlans i think.  how
> we see would do things would be to have a single 10g uplink into the
> network. say we had a 100 node system. 
> we would bond all 4 vlans into the uplink, then want to setup the
> switch fabric on the system to be something like 
> nodes 1-20 - fedora infra public vlan <where we run our proxies and
> appservers etc> 
> nodes 21-40 - qa vlan for tying into the qa infrastructure
> nodes 41-100 - build vlan, where all our builders live.

It will possible to set up a system this way. The ECMEs will have
support for VLAN tagging, and you would set up the VLAN IDs as part of
the normal process of configuring the network and fabric. The basic
process would be a sequence of IMPI and TFTP transfers to request the
node configuration files, edit them, return them to the nodes, and
commit them. You'd have to do some of that anyway just to set up things
like static IP vs DHCP.

The network guys did have this to say specifically:
"I would like to note, that while your configuration is perfectly valid,
it may result in uneven performance. Using only one of the four uplinks
means connecting at only one point on our fabric. I understand that 10Gb
ports may be hard to come by, but four 1Gb uplinks may provide a more
even performance than a single 10Gb uplink.

"And since you have four VLANS, if you went to four 1Gb links, you could
have your switch ports act as termini for the four VLANS and then
through our configuration interface map the network interfaces to match
your VLAN needs. In that fashion, you would not need to have the
management engine and servers add/remove VLAN tags at all."

Hope this information helps you guys decide your provisioning plans.

- --Mark Langsdorf
Calxeda, Inc.

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