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First, connect a display+keyboad to see what is going on. Having a look at the system log using the journalctl command would help as well as ip a.

Yes, would result in a lost pool as you are forcing the replace.

No, should be partition 3 of your failed disk that gets replaced by sda3. So: "zpool replace -f <rpool> <nvme1n1p3> <sda3>" You need to, but only "proxmox-boot-tool init <sda2>" and not "proxmox-boot-tool init <sda2> grub".

Nein, ich meine den absoluten pfad zum "pct" Programm. Den bekommt man über den "which" Befehl. Also z.B.: root@Voyager:~# which pct /usr/sbin/pct Da würde man dann "/usr/sbin/pct fstrim 100" benutzen und nicht nur "pct fstrim 100".

Besser in der cron mit absoluten Pfaden arbeiten anstatt nur "pct" anzugeben. Außerdem aufpassen, dass sich der trim nicht mit einem Backup Job kreuzt, da der fstrim den LXC lockt und dann der Backup Task fehlschlagen würde. Musst du wie gesagt von innerhalb der VM machen und ist daher je nach...

TrueNAS is only an appliance. There you are not supposed/allowed to touch anything that isn't integrated in the webUI. PVE is a full OS any you can tamper with it as you like, install whatever you want and so on. If I decide that I want to install a desktop environment and steam to play some...

I always run apt autoremove after each upgrade so old kernels get removed to not run into this problem, of boot partition running out of space, in the first place.

Before removing the disks you should enable the maintainance mode for that datastore and export the pool via "zpool export".

MSATA SSDs would still be like 500 times faster than your HDDs. Everything is better than running a HDD-only datastore. Manual clearly recommends to best use SSD-only or in case you still want to use HDDs, combine HDD+SSD but not HDD-only. And yes, it is possible to import the ZFS pool and...

A touch /etc/.pve-ignore.hostname within the LXC should prevent PVE from tampering with the hostname file.

Correct. Its possible to exclude virtual disks from backups. Snapshots will snapshot everything. Also keep in mind that neither a snapshot nor a raid1 will replace a proper backup. You should have proper backups (see 3-2-1 backup stragety) of those 20TB anyway.

LXCs muss man über ein "pct fstrim DeineVMID" vom PVE Host aus trimmen. Du editierst die /etc/crontab oder nutzt "crontab -e" über die CLI. "fstrim -av" in der VM. Sollte man aber halt stündlich/täglich/wöchentlich machen, je nachdem wieviel man schreib. Wirst du vergessen regenmäßig manuell...

Its also possible to freely limit the max frequency in a similar way.

There should be a line like "nameserver 8.8.8.8" pointing to the IP if your DNS server (which is usually your routers IP address).

You didn't used the SSDs as special devices or parts of these as metadata-only-L2ARC to boost the performance of the HDDs? This would have increased the GC performance by magnitudes and a little bit with backup/restore/verify.

Genau. Du musst dafür für die virtuelle Disk der VM auch die "Discard" Checkbox angekreuzt haben sowie ein Protokoll wie virtio SCSI gewählt haben was TRIM Befehle unterstützt, damit ein GastOS über discard/fstrim auch wieder Speicherplatz freigeben kann. Dafür musst du dann das GastOS aber...

If you don't want to store any guests there, you could destroy it and expand the root LV with it to be able to store more ISOs/templates/backups. So according to your output, root filesystem is only 12% filled and thin pool only 16%.

I added this to my /etc/crontab to set the mode for all cores after reboot: # schedutil instead of performance for intel_pstate governor @reboot root echo "schedutil" | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor >/var/log/cron.log 2>&1 You could edit this to match your...

In case you can't find anything, did you ever edit your fstab or similar to mount some filesystem manually and then set that up as a directory storage but not setting the "is_mountpoint" option?

LVM Thin pools can only be destroyed. Shrinking is not possible. The forums search function should show you lots of threads on how to do this. How full your LVM thin pool is you will get with lvs. df -h will show how full the root filesystem is. You should analyse whats consuming all the space...