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this post was submitted on 08 Jan 2024
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I haven't done it - but I believe Proxmox allows for creating a "backplane" network which the servers can use to talk directly to each other. This would be used for ceph and server migrations so that the large amount of network traffic doesn't interfere with other traffic being used by the VMs and the rest of your network.
You'd just need a second NIC and a switch to create the second network, then staticly assign IPs. This network wouldn't route anywhere else.
In proxmox there's no need to assign it to a physical NIC. If you want a virtual network that goes as frast as possible you'd create a bridge or whatever and assign it to nothing. If you assign it to a NIC then since it wants to use SR-IOV it would only go as fast as the NIC can go.