question multicast/unicast proxmox v6

[gijsbert]

On previous versions of proxmox the advice was not to use unicast in a cluster with more than 4 nodes:

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Due to increased network traffic (compared to multicast) the number of supported nodes is limited, do not use it with more that 4 cluster nodes.

source: https://pve.proxmox.com/wiki/Multicast_notes
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Now in proxmox 6 I read that multicast is not supported and we should use unicast instead. This pretty much conflicts with the (older) advice not to use unicast in a cluster with more than 4 nodes.

So, where to go if we use i.e. 12 nodes in a cluster? Any advice before upgrading?

Gijsbert

 

[wolfgang]

Hi,

corosync2 and corosync3 are completely different so this is why the advice is changing.
It is not because we change our meaning about it.

 

[gijsbert]

So it is ok to do unicast in a cluster running 12 nodes using corosync3/proxmox6?

 

[wolfgang]

Yes, the supported limits are the same.

 

[gijsbert]

Sorry, I don't understand. What do you mean by "supported limits" ? Maximum of 4 cluster nodes?

 

[tom]

Sorry, I don't understand. What do you mean by "supported limits" ? Maximum of 4 cluster nodes?

no, see https://pve.proxmox.com/pve-docs/pve-admin-guide.html#chapter_pvecm