Proxmox HA - 50% nodes online quorum

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krzysiexp

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Apr 3, 2018
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Hi!
I have 4 nodes cluster.
I want to have a quorum when two of them are offline.
I tried setting auto_tie_breaker in corosync.conf and corosync-quorumtool -e 2 but both methods didin't work.
How to configure that?
And another question, why changing corosync.conf after creating cluster with pve-command tools is not safe and how to change config of this service in the right way?
Yes, I know that when cluster is created from 4 nodes you should have at least 3 nodes to quorum.
 
Sure you will not like to have a 50% quorum. That will give you split brain problems. Split brain will lead to VM's running twice and destroying their images, so don't do it. Don't ever think about a 50% quorum.

you can setup for example a fifth node on a small box just as an quorum node. Even a Raspberry would do for that, as long as you exclude it from HA Groups.
 
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Ok, I understand this.
Is there any way else to have a quorum without additional Proxmox node? For example will fencing with cisco switch do the job?
 
You need even quorum to use a fence device like a cisco switch quorum.
 
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