Re: [pve-devel] [PATCH docs 1/7] pvecm: drop notes about old version incompatibilities

[Kevin Schneider <k.schneider@proxmox.com>]

On 29.04.25 15:57, Aaron Lauterer wrote:
> Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>
> ---
>   pvecm.adoc | 12 ------------
>   1 file changed, 12 deletions(-)
>
> diff --git a/pvecm.adoc b/pvecm.adoc
> index 18f7389..47e42e2 100644
> --- a/pvecm.adoc
> +++ b/pvecm.adoc
> @@ -77,18 +77,6 @@ Requirements
>   * Online migration of virtual machines is only supported when nodes have CPUs
>     from the same vendor. It might work otherwise, but this is never guaranteed.
>   
> -NOTE: It is not possible to mix {pve} 3.x and earlier with {pve} 4.X cluster
> -nodes.
> -
> -NOTE: While it's possible to mix {pve} 4.4 and {pve} 5.0 nodes, doing so is
> -not supported as a production configuration and should only be done temporarily,
> -during an upgrade of the whole cluster from one major version to another.
> -
> -NOTE: Running a cluster of {pve} 6.x with earlier versions is not possible. The
> -cluster protocol (corosync) between {pve} 6.x and earlier versions changed
> -fundamentally. The corosync 3 packages for {pve} 5.4 are only intended for the
> -upgrade procedure to {pve} 6.0.
> -
>   
>   Preparing Nodes
>   ---------------

  In 8.2 we modernized the handling of host keys for SSH connections 
between cluster by moving them onto the cluster filesystem. We also 
introduced symlinks for the ceph.client.admin.keyring and ceph.conf 
files. So =<8.1 and =>8.3 are not compatible.

For the documentation it would probably the best to either include 
recent limitations or clearly state, that nodes should only have a 
single dot release difference between each other  and give examples like:

Perfect: All Nodes are up to date

Good: 8.1 and 8.2

Bad: 8.1 and 8.3 ; 8.1 and 8.2 and 8.3



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