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I noticed in the log a page fault which cascaded through things, have you tested the memory on the NUC? [You can access it via the boot iso, advanced section on 7.4, I think.]

For each of the backups, the backup entry on proxmox will have a log of what happened with each machine: The above is to give you an idea of where to look. Others here who know more will want that info, could you post up the backup logs for VMs which failed to start, and ones which did start ok?

You can, if you're feeling creative, take an old BBW battery, open it up, remove the LiPro cells, and replace them... I've done that before, it can save quite a lot of money [$14 vs $300+] Admittedly, the last one I worked on did involve snipping some legs and soldering in the legs of a new...

Okay, what I do with systems is I run a VM with Grafana and Prometheus in it. In terms of getting the information from sensors, I install the version of "node exporter" which comes with the distro [Proxmox in this case.] You make sure it can talk to systems asking for the node information, so...

Sorry about the late reply, I work quite long hours [was only up at that time due to phenomenally bad insomnia]. Okay, not quite the worst has happened, there are options. Let's try something extreme. You could clone the drive, ignoring errors and sector by sector, to a backup file on external...

That really depends on how mission-critical it is, for many people, it would be fine, but I would suggest having a UPS to allow it to shut down gracefully; you can purchase that later. One major benefit you would gain is experience, but be careful it's not at the expense of your business ;) So...

Surely a 2-CPU Xeon setup would require 1 RAM stick per CPU? [Rest looks good.] However, that might be board dependent, but it stands out to me.

Could you tell us more about the host hardware on the origin system? [This is for people investigating later.] Also, other than PBS, which you're trying to backup the VM to, do you have a local backup or backup copy somewhere else of the VM concerned? [Or, at least, a backup of the data in the...

Well, if they can't be bothered to label their release repositories properly, you'll have to put the setting back to "stable" and live with the warning message. Thinking professionally, it would be wise to run some of those repositories [grafana especially] within a VM [Ubuntu Server works...

It would be best to shut that machine down and determine why the temperature is so high. It could be a case fan has failed or is needed. If the nvme lacks a heatsink, fit one. However, in all cases, you must ensure your data is backed up; you should already be doing this.

@Abhijit Roy Out of interest, do you have a rough diagram you could post of what you intend so far? It'll help with working out if something is missing. Also, about the earlier question on a fencing device, I work with smaller setups, so I haven't needed to use one personally, but if you are...

Actually, how creative are you feeling? If you secure the replacement drive [in a separate secure bay/caddy], you could have the cabling and power going from the outside of the server case to the internals, allowing you to run the 4-bay array + the extra drive. After the restoration, you could...

@Dunuin This looks particularly dangerous, as he's running with no redundancy on that Z1. My thought would be to backup the data, physically replace the faulted drive, and then run the ZFS replace command to bring everything back into a non-degraded state. However, that's a pretty "Exciting"...

So, just clarifying, you are typing: zpool offline NXWitnessStorage ata-WDC_WUH721816ALE6L4_3HH568PN https://openzfs.github.io/openzfs-docs/man/8/zpool-offline.8.html Your plan is to use zpool replace to replace the faulty drive: https://openzfs.github.io/openzfs-docs/man/8/zpool-replace.8.html

*looks to his left at a custom Proxmox Cube* Yes and no, I have a box here which ran quite well, and then it started having ZFS kernel panics under load. All equipment passed testing, including memtest. So, I took a few educated guesses, and replaced the 32GB RAM with 64GB higher-quality...

Try setting up a USB stick with Memtest: https://www.memtest.org/ Now, it could be nothing, but if there's a memory fault somewhere, it'll be a battle you cannot win without replacing the faulty RAM stick.

He might be thinking of this: https://clusterlabs.org/pacemaker/doc/deprecated/en-US/Pacemaker/2.0/html/Pacemaker_Explained/_fence_devices.html

Note: Plan for when things go wrong. So, UPS units, how much uptime do you want to aim for, and the appropriate settings/configuration to ensure Proxmox shuts down as expected. During this time of shortages, it is crucial to ensure you have spares: Spare HDDs/SSDs. Perhaps an extra RAM stick or...

Ah, I've seen this in ZFS. So, your pool in the above picture is probably being shared with another storage location. In my case, I had a ZFS thin pool, and directory storage on the same device. If I add files to the directory, the ZFS thin pool shrinks accordingly. Do you have a backup job...

The Samsung 980 SSD is pretending to have 512-byte sectors, but it has 4K internal ones: https://www.reddit.com/r/archlinux/comments/qbigpc/wrong_sector_size_on_samsung_ssds/ So, technically, you want ashift=12. However, the real question is, will the drive behave when given its native sector...