I recently upgraded from version 5.2 to version 6.3-4 following the instructions in the proxmox documentation in 2 server.
The process has been carried out correctly but I have had the following errors that I think I have to comment on in case it happens to someone else.
The proxmox are installed starting from a Debian installation and the upgrade it has been done on both servers in the same way and at the same time.
1. In one of the nodes the name of the network adapters has been changed and they had to be reconfigured, previously they were as enp3s0f0, enp3s0f1 etc.. and it has named them as eth0, eth1 etc ... change the interfaces files resolved.
2. In Windows virtual machines the hard drives do not appear online, we have to go to the disk manager and put them online again.
3. In Windows virtual machines, the virtio network adapters have been redetected and we have to reconfigure the network on each of the machines.
I hope this information is useful to someone who runs into the problem.
Greetings
The process has been carried out correctly but I have had the following errors that I think I have to comment on in case it happens to someone else.
The proxmox are installed starting from a Debian installation and the upgrade it has been done on both servers in the same way and at the same time.
1. In one of the nodes the name of the network adapters has been changed and they had to be reconfigured, previously they were as enp3s0f0, enp3s0f1 etc.. and it has named them as eth0, eth1 etc ... change the interfaces files resolved.
2. In Windows virtual machines the hard drives do not appear online, we have to go to the disk manager and put them online again.
3. In Windows virtual machines, the virtio network adapters have been redetected and we have to reconfigure the network on each of the machines.
I hope this information is useful to someone who runs into the problem.
Greetings