Channel Bonding

Unanswered Question
Jun 26th, 2008

I posted this question on another forum but recieved no response. I thought maybe this one was more appropriate.

I have several servers that we are about to deploy Oracle RAC to. Each of these servers have 6 NICs. We would like to take 4 of the NICs and dedicate them to the RAC interconnect in bounded pairs. I would like to bound 2 NICs (for ~200MB of throughput) and connect them to 6509E and configured the other 2 NICs and connect them to another 6509E for failover purposes. I would like the VIP IP to be used on all 4 NICs.

I would suspect that I would use LACP on the switch side, but what would I need to do on the server side? Im using Broadcom NICs, and was hoping to use a kernel mode driver (vs. the Broadcom software). Is this a common practice?

Also, are there any switch configuration settings for tweaking performance (other than jumbo frame support).

I have this problem too.
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Kevin Dorrell Thu, 06/26/2008 - 04:34

You are right that the best way would be to use LACP. On your server side, the option will probably not be called LACP, but 802.3ad.

Kevin Dorrell


joemarr_brodart Thu, 06/26/2008 - 17:56


your correct it would be 802.3ad. In order to get the RAC VIP on to the ports, I would need to create a single bond group for all 4 ports on the server side. Can I then split them so 2 ports are on each switch?

Kevin Dorrell Thu, 06/26/2008 - 23:01

Mmm, not sure how you do that on the server side. I know how you bond the NICs, but not how you get two bonded groups. If I get a chance, I shall ask one of the server guys today.

Kevin Dorrell


joemarr_brodart Fri, 06/27/2008 - 05:41

You cant (well not if you want to use the same IP across them).

My thought was to create 1 group of 4 on the server, and then create 1 group of 2 on each switch. I'm just not sure of the impact.

Kevin Dorrell Fri, 06/27/2008 - 07:23

That's unfortunate. I don't think it's going to work then. Are you running VMware by any chace? If so, you might be able to do something with the virtual switches.

Kevin Dorrell



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