[Linux-cluster] Small Cluster, Port Trunking, To use switch or not?
pillai at mathstat.dal.ca
Fri Sep 7 16:17:02 UTC 2007
For 802.3ad bonding mode, the switch needs to support lacp. Static
trunking feature on the switch
is not enough. In your case with no switch support, mode 6 or adaptive
load balancing is a good option.
Round robin is the only mode that will give you more than an interface
worth of throughput on a single connection.
But that needs some switch support. (like cisco etherchannel for
example) Also there is additional overhead
due to out of the order packets. The other modes will give better
Frankie Montenegro wrote:
> Thanks. That will be very usefull when I start putting things together.
> Did I understand this howto correctly: either way, switch or not, my
> network devices need to be complient with this 802.3ad protocol if I
> want to bond them. RIght?
> Well that's a bummer: I can't use the network cards on board of my
> "cheapo" motherboards, which means I have to buy 2 cards per node (
> and the cheapest card with support of this
> protocol was around 50$) . I guess I better forget about bonding then.
> On 9/7/07, Bob Marcan <bob.marcan at interstudio.homeunix.net> wrote:
>> Frankie Montenegro wrote:
>>> Hi everyone,
>>> I am building a small HPC cluster with two slaves and a master. I can
>>> put together two slave nodes with under 350$ per node, so I don't want
>>> to spend more then 70-80$ for networking.
>>> Buying a gigabit ethernet 4 port switch would be the most
>>> straightforward solution. However, I was hoping to get "port trunking"
>>> set up, and doubling the network speed. Since this is not supported
>>> by switches that are within my budget, I wondered if I can achieve
>>> port trunking without a switch, just
>>> adding couple of network cards to the master node and having a
>>> master node be a switch. WIll I be able to get 2Gbps or is this idea
>>> completely idiotic?
>>> Linux-cluster mailing list
>>> Linux-cluster at redhat.com
>> Look for mode.
>> Regards, Bob
>> Bob Marcan, Consultant mailto:bob.marcan at snt.si
>> S&T Slovenija d.d. tel: +386 (1) 5895-300
>> Leskoskova cesta 6 fax: +386 (1) 5895-202
>> 1000 Ljubljana, Slovenia url: http://www.snt.si
>> Linux-cluster mailing list
>> Linux-cluster at redhat.com
> Linux-cluster mailing list
> Linux-cluster at redhat.com
More information about the Linux-cluster