Skip to main content
Question

Unable to re-add a node to the 3-node cluster.

  • August 10, 2026
  • 5 replies
  • 41 views

anhpc

Our AHV cluster consists of 3 nodes (running AHV version 11.0.1 and AOS version 7.5.1.1).
Node C (host IP: 192.168.155.236, CVM IP: 192.168.155.239) experienced an issue, so we re-imaged it using Foundation with new IP addresses (host IP: 192.168.155.229, CVM IP: 192.168.155.230). Node C is now running newer versions—AHV 11.1 and AOS 7.5—but attempts to add it back to the cluster have failed.
Is there a way to add Node C back to the cluster?

5 replies

JeroenTielen
Forum|alt.badge.img+8

That will nog work. Please raise a support ticket on this. 3 node cluster with 1 node down need to be fixxed first before you can add a node. 


jarrodl
Forum|alt.badge.img+2
  • Vanguard
  • August 10, 2026

Disregard my origional comment, my understanding was not correct


JeroenTielen
Forum|alt.badge.img+8

Our AHV cluster consists of 3 nodes (running AHV version 11.0.1 and AOS version 7.5.1.1).
Node C (host IP: 192.168.155.236, CVM IP: 192.168.155.239) experienced an issue, so we re-imaged it using Foundation with new IP addresses (host IP: 192.168.155.229, CVM IP: 192.168.155.230). Node C is now running newer versions—AHV 11.1 and AOS 7.5—but attempts to add it back to the cluster have failed.
Is there a way to add Node C back to the cluster?

You will need to run the node through the foundation again, making sure it’s the same version as the other nodes.

 

Or you can upgrade all the nodes to the version that version c has and then try and add it back.

Either way, all nodes need to be the same version.

Will not work. As current cluster is a 2 node cluster with a broken third node. 


jarrodl
Forum|alt.badge.img+2
  • Vanguard
  • August 10, 2026

Our AHV cluster consists of 3 nodes (running AHV version 11.0.1 and AOS version 7.5.1.1).
Node C (host IP: 192.168.155.236, CVM IP: 192.168.155.239) experienced an issue, so we re-imaged it using Foundation with new IP addresses (host IP: 192.168.155.229, CVM IP: 192.168.155.230). Node C is now running newer versions—AHV 11.1 and AOS 7.5—but attempts to add it back to the cluster have failed.
Is there a way to add Node C back to the cluster?

You will need to run the node through the foundation again, making sure it’s the same version as the other nodes.

 

Or you can upgrade all the nodes to the version that version c has and then try and add it back.

Either way, all nodes need to be the same version.

Will not work. As current cluster is a 2 node cluster with a broken third node. 

I throught if you had a three node minimum cluster, you could handle a node failure (depending on your RF factor). I was not aware that if you had a 3 node cluster that you had to jump through hoops to get it back to a 3 node after a failure.


JeroenTielen
Forum|alt.badge.img+8

@jarrodl yes. As 3 node is bare minimum. With 1 node down there are 2 left. And you need to have a fully correctly working cluster to do node expansion. Meaning first get the original 3 node back in the cluster. And that is, in this case, not possible anymore. So support is your only option. (Or migrate all vm’s off, reinstall cluster, migrate back)