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Sorry. Should have better read the docs (which I did) https://pve.proxmox.com/wiki/Upgrade_from_3.x_to_4.0 states New corosync version, therefore clusters has to be re-established So I guess I can't mix 3 pmx3 and pmx4 in the same cluster.

Hi, So excited about proxmox 4.2. But I still run a proxmox 3 cluster, with no HA and clvm on iSCSI. But I read migration from 3 to 4 is not that easy Is it a good to idea to add a new proxmox 4 member in the cluster ? My plan is : add new member in the cluster while there exist proxmox3...