Date: Tue, 16 Dec 2025 22:29:33 -0700 From: Warner Losh <imp@bsdimp.com> To: Martin <iio7@protonmail.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Prevent spin-up of USB HD after upgrading to FreeBSD 15 Message-ID: <CANCZdfooL8vCCKbm0txCb%2BTDffGhxc1fDD4SwVLM08tDZPz=GA@mail.gmail.com> In-Reply-To: <j7XoSQMU-9G-lOiNcAsrUE4FmIzX26V971Z5fLI7RtfIyvm_6PoXbSksem-pXoMZNy9CchKhGl7C2T9xkQAlL84Y89Y5byUOkOuIwSnBtlY=@protonmail.com> References: <j7XoSQMU-9G-lOiNcAsrUE4FmIzX26V971Z5fLI7RtfIyvm_6PoXbSksem-pXoMZNy9CchKhGl7C2T9xkQAlL84Y89Y5byUOkOuIwSnBtlY=@protonmail.com>
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[-- Attachment #1 --] 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? Warner Kind regards. > > > [-- Attachment #2 --] <div dir="auto"><div><br><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Dec 16, 2025, 10:17 PM Martin <<a href="mailto:iio7@protonmail.com">iio7@protonmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I posted this in "questions", but think this might be the more correct<br> place.<br> <br> I have an external Toshiba USB drive that automatically spins down<br> after about 1 minute of idle. After upgrading to FreeBSD 15, the drive<br> keeps spinning up again about every 5 minutes even though it is not<br> being used and isn't mounted. This didn't happen in FreeBSD 14.3.<br> <br> The drive is running ZFS.<br> <br> I have monitored both /var/log/messages and daemon.log using tail to<br> see if anything happens, but nothing goes on in those logs when it<br> happens.<br> <br> If I export the drive rather than just unmount then it doesn't happen.<br> So I am guessing that it's something ZFS specific/related perhaps.<br> <br> I have also tested the same drive on the same machine using Artix Linux<br> and the drive stays spinned down, even when fully mounted using ZFS.<br> <br> I have used "top -s 0.1" in order to see if I can get a glimpse at<br> something which might run on FreeBSD, but nothing is started.<br> <br> What has changed from 14.3 to 15 that might cause this annoying<br> behavior? How do I track down what's spinning up my drive?<br></blockquote></div></div><div dir="auto"><br></div><div dir="auto">I have a dtrace thing that can find all the commands being sent.</div><div dir="auto"><br></div><div dir="auto">But before i go to the hassle.. what happens if you set kern.cam.da.poll_period=0?</div><div dir="auto"><br></div><div dir="auto">Warner</div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote gmail_quote_container"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Kind regards.<br> <br> <br> </blockquote></div></div></div>help
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