Thanks for your answer.

I use proxmox since version 2.1 in my home lab and since 2020 in production at work. We did not have issues with the ssh files yet. Also corosync is working fine although it shares its 10g network with ceph.

In all that time I was not aware of how the certs are handled, despite the fact I had two official proxmox trainings. Ouch.

Please elaborate. How does it handle ssh keys? And what is fragile regarding corosync?

Yes, some chips (or rather parts of all chips) are spare on enterprise SSDs. You can even see how much is left via smart data

The loss did occur on simple ping commands, only on 2 out of 5 ports. The vendor confirmed the behavior to be faulty and took the switch back.

Maybe it was just a faulty model? However I do use multicast in my network (corosync) and a lot of 10G switches seem to have problems with that, maybe this was the case here, too.

The exact model is TRENDnet 5-Port 10G Switch, 5 x 10G RJ-45-Ports and there sure seem to be quite some people having issues as well…

I tried a 5port 10g trendnet switch some time ago, had weird speed issues and package losses. No good experience at all :(