Noisy NAS

Hey Guys, I'm new to self hosting, so please excuse the possibly stupid question. Loving my TrueNas setup, I have x4 14TB Iron Wolf drives (known to be loud!) .

Just wondering if anyone could give some advice, I notice even if nothing is accessing the NAS, the Iron Wolf disks read/write heads are regularly engaged, like very 2 seconds.

I feel like TrueNAS is constantly running checks, not sure if its SMART checks, or scrubling, or data integrity. Even if I turn off all my VMs (I use Proxmox), and make sure NOTHING is accessing any NFS or SMB shares, STILL its crunches away, and its not just for an hour or two, its permanent.

Just wondered if there were any settings I could tune to adjust it. I am running TrueNAS scale, and its just a home setup not production.

Thanks very much in advance!