This is a freshly installed system, I do not have any apps, sysytem dataset pool: boot-pool, 2 HDDs in raid 1
No client is connected. What is strange is that the drives spin up only for a dozen of so seconds and the go back to spin down. When I connect a client, the drives spin up and work normally for 20 minutes, then go to spin down.
Have you checked your SMART service?
By default it checks disks every 30 min
Help: Check Interval
Define a number of minutes for smartd to wake up and check if any tests are configured to run.
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Yes, that was the cause. I set Power Mode to Standby and the drives don’t spin up. Thanks for the help.
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