I’ve noticed that Syncthing will start a reindex on the node that I restart
Why is it doing that?
I’m seeing 100% CPU utilisation on my server which is slowing down a lot of other services
Is there any way to control this?
It’s not really reindexing (unless you’ve wiped out the database or something), but it does need to re-scan every folder for any possible changes that might have happened while Syncthing wasn’t running. The process can indeed take quite some time, especially when using low-end hardware and/or spinning drives.
There’s nothing you can do to work around this problem, unfortunately. The relevant issue is https://github.com/syncthing/syncthing/issues/5353.
As for the CPU usage, Syncthing runs with a lower priority by default, but if you want, you can try using your OS built-in tools to reduce the priority even lower. Just make sure to disable https://docs.syncthing.net/users/config.html#config-option-options.setlowpriority first if you do decide to do so. There’s also the GOMAXPROCS environment variable that you can tweak too.
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