

Could it be doing remote backup during downtime? That could be somewhat compute intensive, if the data is also being encrypted and compressed for the remote target.
Are there no ways to peek at running processes and resource usage on a Sinology NAS? I’d start with that.
Also, how old is the device? Maybe it is overheating due to dirt/dust buildup and some cleaning up and re-pasting would solve the issue.



Oh, nice!
I’m still on TrueNAS CORE and thinking about where to move next.
So far, I’m very impressed by Sylve, but I’ll keep an eye on this too.
PS: While preparing to move to TrueNAS CE, I converted all my jails to VMs, so I could just import them after migrating. But by doing that, I removed my need to move from CORE, as I don’t have jails based on out of date FreeBSD anymore!