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Hi, Thank you for the outputs! Could you please post the output of `hostname -A` command as well? EDIT: and the output of the below command, please! ls /etc/pve/nodes

Hi, You could install the QDevice on a Raspberry Pi, it's an affordable way to provide the necessary 3rd vote for qourm without the need for a full node + will not cost like add a 3th node.

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Have you checked the firewall? if enabled. I would check the tcpdump to see where is the issue.

Hi, You need to assign PVEDatastoreUser on the PBS storage and PVEVMUser on the specific VMs they need access to. Please test these permissions to ensure they meet your requirements.

Hi, If you want to avoid quorum loss, consider installing QDevice [0] on a Raspberry Pi to maintain quorum with minimal power usage. [0] https://pve.proxmox.com/pve-docs/pve-admin-guide.html#_corosync_external_vote_support

Hi, Did you checked our wiki [0] regarding the network considerations? [0] https://pve.proxmox.com/wiki/Proxmox_VE_inside_VirtualBox#Network_Considerations

Hi, Did you try same your config but without `bridge_maxwait`? i.e.: auto lo iface lo inet loopback auto enp5s0 iface enp5s0 inet manual auto vmbr0 iface vmbr0 inet static address 192.168.86.204/20 gateway 192.168.86.1 bridge-ports enp5s0 bridge-stp off bridge-fd 0

Yes, should don't cause any problem. Since this was a solution for many users. And yes since you have enough RAM memory your server don't have to use the swap.

Hi, Did you check the syslog during the joining cluster? You can use `journalctl -f` to see the syslog for any interesting error or warning! Why you changed the SSH keys? Does the Proxmox VE servers have the same version?

Hello, You can disable swap in your node, that is was a solution of some users. You can stop/disable the swap using the following: To disable the Swap, run the following command: swapoff -a In order to disable it permanently, edit the /etc/fstab file and disable the following line by...

Hi, Have you tried to mount the CIFS shares manually using `umount -f /mnt/pve/SwFileServer-cifs` command? If not please can you try? after you unmount the CIFS, try to remove the storage, and re-add it from your PVE Web UI.

Thank you for the output! Can you please also provide us with the output of `pveversion -v`?

Hi, Have you tried to disable the UEFI Boot, since older servers like HP Proliant DL360 may not support UEFI properly! The other solution can be is to install Proxmox VE on top of Debian as described in our wiki guide [0]. [0] https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_12_Bookworm

Thank you for the logs! The losing quorum can trigger the HA manager to initiate a node reboot, which is what seems to be happening, since HA requires stable network communication to ensure that resources are available. If you have only one ring_x in your corosync config, please consider...

Hi, Thank you for the outputs! in the server01 there is no `proxvg`: root@server01:~# pvesm status no such logical volume proxvg/proxthin Name Type Status Total Used Available % ThinDisk lvmthin active 9731174400 0...

Hi, Have you run the `ifreload -a` command? If yes, is there an output?

Can you also post the output of the following command? last reboot -n 10

Can you share what happened in the syslog when a node rebooted? This might help us identify what triggered the reboots. Have you enabled the HA on those nodes?

The config you shared look to be fairly standard. However, can you try to add disable automatic reboot after the upgrade [0]? Unattended-Upgrade::Automatic-Reboot "false"; EDIT: If the server shut down again please provide us with more entries of syslog. [0]...