On Thu, 22 Mar 2012 14:03:41 -0500
Dennis Gilmore <dennis(a)ausil.us> wrote:
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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.
Hopefully that will work. Perhaps we could do multiple 10G interfaces,
I don't know how practical that will be tho.
Inicio del mensaje redirigido:
Fecha: Wed, 21 Mar 2012 18:38:26 -0500
Desde: Mark Langsdorf <mark.langsdorf(a)calxeda.com>
Para: Dennis Gilmore <dennis(a)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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