Date: Wed, 17 Dec 2025 22:29:16 +0000 From: Martin <iio7@protonmail.com> To: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Prevent spin-up of USB HD after upgrading to FreeBSD 15 Message-ID: <t565nv2ZOb8O-k2pel6bLS_AsjvqgIA6Io6cGvbkWjcPbC_miDkRrqzEWflTpN5hvINq7vwhuZ6y8avls__jRm464UoxN944kTpB-8yXXQc=@protonmail.com> In-Reply-To: <CANCZdfooL8vCCKbm0txCb%2BTDffGhxc1fDD4SwVLM08tDZPz=GA@mail.gmail.com> References: <j7XoSQMU-9G-lOiNcAsrUE4FmIzX26V971Z5fLI7RtfIyvm_6PoXbSksem-pXoMZNy9CchKhGl7C2T9xkQAlL84Y89Y5byUOkOuIwSnBtlY=@protonmail.com> <CANCZdfooL8vCCKbm0txCb%2BTDffGhxc1fDD4SwVLM08tDZPz=GA@mail.gmail.com>
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On Wednesday, December 17th, 2025 at 6:29 AM, Warner Losh <imp@bsdimp.com> wrote: > On Tue, Dec 16, 2025, 10:17 PM Martin <iio7@protonmail.com> wrote: > > > 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? > > > I have a dtrace thing that can find all the commands being sent. > > But before i go to the hassle.. what happens if you set kern.cam.da.poll_period=0? It's the same, nothing changes.help
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