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As I say move the config mv /etc/pve/nodes/<src_nodename>/qemu-server/<vmid>.conf /etc/pve/nodes/<targest_nodename>/qemu-server/<vmid>.conf

This dependence mainly on what storage you use. If you have shared storage or distributed you can move the VM config in proxmox cluster fs. If not then you must restore a backup, because you need the VM image to run the VM. Your nodes are on the same release so an upgrade is no big thing.

PVEbld15 is up to date. then update one by one. Stop or migrate all VM from the node that you like to update. If it is clean run the upgrade process. Then reboot the node. Then move on to the next node.

What is the exact usecase? If just the cluster (corosync) there is no need for it. But as VM has always a time drift you should have a local NTP server and use this. Also, it depends on the application if you need the correct time or just an identically time?

Hi, no there are no plans. But you are free to use what you like. NTPD is also not perfect and has some problems.

Hi, why do you like to use OpenVswitch? We recommend Linux Bride and OVS is only for some edge cases.

Does the VSS in the VMs triggers if the backup starts? I don't know Exchange but I guess it is the freeze of the fs that produce the Error. Disable the qemu-guest-agent and test again. Keep in mind if qemu-guest-agent is disabled the OS does not flush the caches and the Backup may not consistent.

This is brand new and I'm guessing it is not final implemented. The patches are on the Mailing list if you are interested.

Hi, pvesm set <storage> -content snippets[,..] https://pve.proxmox.com/pve-docs/api-viewer/index.html#/storage/{storage}

Hi, What do you mean with click "execute".

Flashdrives are known to fail very fast with the logging Proxmox VE use. I would never use them. Instead, use HDD or SSD

Hi, Proxmox VE does not officially support Cloud-init with Windows. 1.) https://pve.proxmox.com/wiki/Cloud-Init_FAQ

Hi, do you use qemu-guest-agent in these VMs? What PVE version do you use?

Hi, What is the output of this command

Hi, the performance is better if you passthrough the HBA. And you can control the disk direct in OMV.

Hi, I guess there will no problem. I the worst case the services can't start, but they will not send evil packages ;-) But you must finish the upgrade on this node. How this works depends on where the upgrade stopped.

Hi, I would recommend you the installation on top of Debian. https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_Buster

Hi, DNS and also HA-Proxy are not always clustered. And if not you have on this stack a single point of failure. Assume you have DNS and HA-Proxy redundant the I would prefer HA-Proxy(the config is simple and can be found in may Blogs). Second DNS. If this is not the case you could use e.g...

Hi, this is not Proxmox VE related, please consult the Hetzner Wiki or ask the support.

Hi, what version do you use on Proxmox BS and Proxmox VE?