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Just out of personal experience, filling all 4 slots with DIMMs and setting a faster XMP profile, default is 3600, everything above is overclocking with profile, would cause one host with an AMD 7900X to behave glitchy and reboot occasionally out of the blue. Setting the RAM speed slower, to...

in /etc/hosts, change the second line back to the FQDN and single hostname the machine had before. Also check if /etc/hostname contains the correct hostname. Then try to run ifreload -a to apply the config from /etc/network/interfaces again or reboot the host.

On a wild hunch, how many memory slots are populated and at what speeds is the memory configured? I don't have that particular Ryzen CPU, but had similar issues with all 4 RAM slots populated and an XMP profile enabled. Only after setting the memory to the base speed without any XMP profile did...

The remaining node is now basically in this scenario https://pve.proxmox.com/pve-docs/pve-admin-guide.html#pvecm_separate_node_without_reinstall Follow the steps on this node until the pvecm delnode command (which would be on a node still in the cluster)

Wait a second, what if you go to the web UI and list the contents of the storage? Do you see the disks? Because in a non-HCI variant, you need to provide all the necessary infos to access the external cluster to the RBD command. The RBD storage plugin of PVE is doing the same...

The Ceph cluster reports HEALTH_OK? Can the PVE node reach(ping) the Ceph MONs and other potential Ceph nodes? You don't by any chance use a large MTU that might not work as expected anymore?

Ich wäre sehr vorsichtig andere MGMT utilities zu installieren. Im schlimmsten Fall grätscht es in PVE rein und verkonfiguriert Dinge die dann mühsam zum Troubleshooten sind.

Users that were created in the PVE realm or PAM? PAM realm users are backed by the local linux users via the PAM system. PVE users will most likely have a second file for the password hashes. Check with ls -l for any files starting with a dot, or/and in the /etc/pve/priv directory.

could it be the same thing as a few years ago? https://forum.proxmox.com/threads/blurry-font-text.91015/#post-398802

The PBS is a backup target. It does not offer any other kind of storage functionality out of the box. But, it is based on Debian Linux. Therefore, no one is stopping you to set up a ZFS dataset and export it as NFS, or install iSCSI tools and configure it as a target for iSCSI over ZFS. How...

You could also pin an older kernel version: proxmox-boot-tool kernel list proxmox-boot-tool kernel pin {kernel} No need to downgrade the full node. Those were released in 2012 if I am not mistaken? I would be prepared that they will be more and more of a problem in the future.

systemctl stop ksmtuned.service systemctl mask ksmtuned.service´ will stop and mask it, so it can't be started in the future.

What exactly do you mean? And is this maybe an answer to your question? https://forum.proxmox.com/threads/feature-request-cinder.140890/#post-632575

Check the docs, the no-subscription repo doesn't use https but plain http. deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription

The subscriptions are one subscription per server . For each server you need to check how many physical CPU sockets are in use. If you go to the Summary panel of each node, it will tell you the CPU info and then at the end of that line in brackets how many sockets are in use. If it is "(1...

Isn't ZFS over iSCSI basically ZFS on the storage host where PVE manages the ZFS volumes and snapshots via SSH and exports them as iSCSI LUNs? Not ZFS on top of iSCSI LUNs?

If data that needs to be read is in the cache/RAM (ARC), then a trip down to the disks is avoided. If you have some monitoring, it can fetch stats on how often the ARC could not satisfy a read operation. arcstat On some of my servers with 128 GiB or RAM, the ARC will vary in size from 40 to 62...

Grundsätzlich: mit welchem alten Kernel gehts noch? Du könntest in dem Fall aber auch gleich direkt ein Backup mit PVE Bordmitteln erzeugen. Entweder richtest du eine externe Platte als Storage ein, oder lässt vzdump direkt laufen. Dann kannst du nämlich --dumpdir Parameter verwenden um die...

Is your DNS provider listed in the available plugins for the DNS challenge? Validating the domain via a DNS challenge would be a bit easier in this situation :)

are the new disks at least exactly the same size or a bit larger? even if they are smaller, they seem to be installed with ZFS for the root filesystem. Check out this blog post, it handles moving the OS to smaller disks, but the overall process should also give you enough of an idea if the...