Date: Wed, 17 Dec 2025 05:17:02 +0000 From: Martin <iio7@protonmail.com> To: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Prevent spin-up of USB HD after upgrading to FreeBSD 15 Message-ID: <j7XoSQMU-9G-lOiNcAsrUE4FmIzX26V971Z5fLI7RtfIyvm_6PoXbSksem-pXoMZNy9CchKhGl7C2T9xkQAlL84Y89Y5byUOkOuIwSnBtlY=@protonmail.com>
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I posted this in "questions", but think this might be the more correct place. I have an external Toshiba USB drive that automatically spins down after about 1 minute of idle. After upgrading to FreeBSD 15, the drive keeps spinning up again about every 5 minutes even though it is not being used and isn't mounted. This didn't happen in FreeBSD 14.3. The drive is running ZFS. I have monitored both /var/log/messages and daemon.log using tail to see if anything happens, but nothing goes on in those logs when it happens. If I export the drive rather than just unmount then it doesn't happen. So I am guessing that it's something ZFS specific/related perhaps. I have also tested the same drive on the same machine using Artix Linux and the drive stays spinned down, even when fully mounted using ZFS. I have used "top -s 0.1" in order to see if I can get a glimpse at something which might run on FreeBSD, but nothing is started. What has changed from 14.3 to 15 that might cause this annoying behavior? How do I track down what's spinning up my drive? Kind regards.help
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