[SOLVED] IS safe to mix proxmox 3 and proxmox 4 in the same cluster ?

[pmxgl]

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 member :
migrate VM from one of the current proxmox 3 node to the new proxmox 4 node
remove the proxmox 3 node from cluster
reformat the proxmox 3, using proxmox 4
join cluster

 

[pmxgl]

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.

 

[wosp]

No, you can't mix PVE 3.x and PVE 4.x. But if you use shared storage you can simply shutdown the VM on PVE 3.x and move the .conf file to a PVE 4.x node and start the VM. This way we migrated many VM's from PVE 3.x to 4.x without any problem and almost zero downtime.