I'm experiencing the same issue. The disk spins up once a day at the same time (13:45 GMT+9). This occurs only on the ZFS pool and never happened on the existing XFS pool. I am certain it is caused by ZFS. Below are the actions I've already taken: - Disabled all scheduled tasks - Disabled ZFS autotrim - Removed the ZFS master plugin - Disabled all shares on that pool - Disabled Docker - Disabled VMs - Disconnected the Ethernet cable If you've resolved this issue or are experiencing the same symptoms, please share your experience.