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Meine „älteste“ Samsung SM883 1.92 TB läuft jetzt knapp ein Jahr durch, hat 20 TB geschrieben und 99% Restleben. Meine „älteste“ Intel S3710 200GB hat 68506 Stunden auf dem Buckel, 441 TB geschrieben und 93% Restleben.

Das bleibt letztlich dir überlassen und liegt auch dran, wie dein restliches Netzwerk so aussieht. Eine vlan-aware Bridge ist nicht schlechter als zwei NICs ohne VLANs. Zwei Interfaces im selben VLAN sind hingegen eher ein Grund für Probleme. ;)

I'm more the logical network guy, not the physical one. Do you have any hint in the kernel logs or dmesg? What is the output of the networking service at the time of an outage?

Seems like it is possible to create a mirror out of a single disk. https://www.medo64.com/2017/08/adding-mirrored-disk-to-existing-zfs-pool/

Which solution are you referring to? The only software raid that Proxmox supports natively is zfs. Did you install with zfs or did you choose lvm? In the latter case you're probably easier off with a reinstall.

ls -l /boot seems to be a more reliable way of finding installed kernels.

Was meinst du mit „auf einen root Server zwei Proxmox installiert“?

At least the prerequisites are all met. Did you try another browser?

If the network works per se, there is nothing in /etc/network/interfaces of relevance. I would rather guess that your IT department has configured the DHCP server to only talk to known hosts. So you should definitely talk to them first to rule out any configuration issue that is outside your...

Die Input-Policy auf Accept zu stellen, hilft nur deinen Nodes. Für die VMs gelten die Policies der VM-Firewalls.

Did you harden your ssh in any way? You need root login permitted and allow receiving (and sending) of environment variable LC_PVE_TICKET.

Did you restart cron afterwards?

Then I would consider this an expectable side effect. Latency on the sixth node it not low enough after firing up a guest with network. You should definitely define a separate Corosync network on a separate interface.

And that's it? No dedicated network for Corosync?

Could you share /etc/network/interfaces of your cluster? At best of a working and the problematic node.

Do you NAT on the host or do you have a bridge? Any firewall active for the VM?

Any duplicate addresses in any of your networks?

This is how it's done: https://linuxize.com/post/how-to-set-or-change-timezone-on-debian-10/

I guess almost every sorting algorithm that exists would sort the nodes that way. Maybe you should think of another naming scheme ...

Ich habe Proxmox auf einem Odroid H2 erfolgreich laufen gehabt. Das ist erträglich von der Performance, RAM kann bis auf 32GB aufgerüstet werden (leider kein ECC) und hinreichend stromsparend ist der eigentlich auch. Falls Interesse besteht, ich denke über einen Verkauf nach ... :)