Hello Alexis.

Why use all those physical NICs and not simplify with fewer NICs and cabling.

Things like Management, Migration and Display you may put on the same set of NICs (bond0) as Management and Display traffic are marginal so you have an almost dedicated NICs for Migration traffic.
Then yes is good to separate VMs traffic and iSCSI in different set of NICs.

If you really want to use all your physical NICs add the one left in this scenario to either add more bandwidth to VMs traffic or to user as active/backup if you have two non-stackable switches, either with bonding too.

Regards
Fernando

2017-04-14 10:37 GMT-03:00 Sandro Bonazzola <sbonazzo@redhat.com>:
Adding Dan and Marcin

On Wed, Apr 12, 2017 at 9:29 AM, Alexis HAUSER <alexis.hauser@imt-atlantique.fr> wrote:
Hi,


I have an Ovirt installation with 3 nodes (5 soon), containing 6 network cards (8 soon), a multipath iSCSI array and I would like to know how you would advice me to choose which link to bond or not.

I thought about :

1+2 : ovirtmgmt (bond)
3+4 : iSCSI (multipath)
5 : VM and Display
6 : Migration

What do you think about this configuration ?
Is it a bad idea to set VM and display on the same network interface ?
Do ovirtmgmt need high bandwidth ?
In terms of bandwidth, is it a bad idea to have one single NIC for Migration ?


Thanks in advance for your suggestions

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SANDRO BONAZZOLA

ASSOCIATE MANAGER, SOFTWARE ENGINEERING, EMEA ENG VIRTUALIZATION R&D

Red Hat EMEA


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