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@Alwin : like I said, it would be nice if proxmox somewhere documented on how to increase the open files per process (or provide a command for this, or per server a setting, ...) and tell people that currently this parameter can cause load issues / server hangs if too low. In my case it blocked...

Again: not sufficient for services launched/managed by systemd. And while it is nice to post this info, in the other thread this is already discussed in length.

fs.file-max is NOT the open files limit per process! fs.file-max is the maximum file descriptors enforced on a kernel level, which cannot be surpassed by all processes without increasing. See /proc/PID/limit en change PID with the PID of a running kvm instance. It is at 1024 and since this also...

Check the open filedescriptor limit on your proxmox hosts for your kvm processes, you might be running into that limit. I had that yesterday and the same weird behavior happened (high load, but no cpu or io on disk or network). The default limit is 1024, which seems to be way too low for server...

It seems this is still an issue on 6.2. Is there any specific reason why the number of open files for a kvm guest would be limited to 1024? Any decent webserver guest would already get into trouble with this limit since the host blocks most network traffic. Also there doesn't seem to be any...