On Fri, 2021-03-26 at 21:46 -0600, Chris Murphy wrote: > On Fri, Mar 26, 2021 at 5:21 PM Patrick O'Callaghan > <pocallaghan@xxxxxxxxx> wrote: > > > > I have an external USB-3 2-disk docking station, and a script which > > can > > power up and down the drives as needed. > > > > I have a systemd automount unit that correctly powers up the dock > > when > > accessed, then mounts the drives (thanks Ed). > > > > After an idle time, automount unmounts the drives. A script detects > > when this happens and powers them down ... *at which point they > > immediately power up again, and remain up until I intervene > > manually, > > even though they are unmounted*. > > > > This never happens if I run the script directly from the command > > line > > (i.e. the drives power down and stay down). > > > > Clearly the docking unit isn't just doing this flakily on its own. > > Something is making it happen, and I've no idea how to discover > > what it > > is except that it seems to be correlated with systemd in some way. > > > > All of the above is 100% reproducible. > > > > I'm open to suggestions if anyone has any ideas. > > smartd? > > I use this line in smartd.conf to keep it from waking up the drive > all the time. > > /dev/disk/by-id/wwn-0x5000c500a93cae8a -l selftest -s L/../15/./22 -n > standby,250 > > Since it's unmounted, fatrace won't work, but blktrace will.. > > blktrace -d /dev/sdb -o - | blkparse -i - > > It will generate a lot of lines but it'll also report the process > that's sending commands to the drive. Just to close this off: I looked briefly at blktrace but haven´t had the energy to follow it up (the output need a fair amount of decoding, even with blkparse). I have since switched from MD/ext4 to BTRFS/Raid1, and the dock now powers down the first time and doesn´t come back up again. I´m assuming that MD was the culprit all along for some reason. poc _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
