Re: [systemd-devel] Guidance on automount/unmount for external powered devices - SOLVED
On Thu, 11 Mar 2021 at 11:00, Patrick O'Callaghan wrote: > Apologies in advance if this is a FAQ, or if there is a more > appropriate list for this question. I'm looking for a step-by-step > guide for the following situation: > > I have an external 2-bay USB3 drive enclosure, configured as an MD > Raid-1 device. This works without issue. > > I normally only use the device for nightly backups, so would prefer to > leave it powered off until needed. > > I have scripts to power it up (creating the appropriate /dev/md entry > and mounting the drive) and down (unmounting, removing the /dev/md > entry and sending a magic signal to the USB device so it powers itself > down after 30 minutes). > > Unfortunately a system reboot always leaves it in the 'powered up and > present in /dev/md' state, so I have to manually run the power-down > script every time I reboot. This is inelegant. > > I would much prefer to have this all handled automagically by systemd, > but I need guidance on how to configure it. If it weren't for the power > question, I know I can just use automount (and have managed to get this > far on my own), but I don't know where or how to insert the power > scripts. My reading of the systemd docs leads me to think that > ExecStart/Stop might be the way, but where do I put this? Do I need a > specific foo.mount unit (I'm currently using /etc/fstab)? > After a good deal of thrashing around, I settled on using "inotify -e unmount" to detect when automount unmounted the drive, and used that to trigger the power-down script. poc ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Guidance on automount/unmount for external powered devices
On Fri, 2021-03-12 at 23:00 +0100, Silvio Knizek wrote: > Am Donnerstag, dem 11.03.2021 um 11:00 + schrieb Patrick > O'Callaghan: > > Apologies in advance if this is a FAQ, or if there is a more > > appropriate list for this question. I'm looking for a step-by-step > > guide for the following situation: > > > > I have an external 2-bay USB3 drive enclosure, configured as an MD > > Raid-1 device. This works without issue. > > > > I normally only use the device for nightly backups, so would prefer to > > leave it powered off until needed. > > > > I have scripts to power it up (creating the appropriate /dev/md entry > > and mounting the drive) and down (unmounting, removing the /dev/md > > entry and sending a magic signal to the USB device so it powers itself > > down after 30 minutes). > > > > Unfortunately a system reboot always leaves it in the 'powered up and > > present in /dev/md' state, so I have to manually run the power-down > > script every time I reboot. This is inelegant. > > > > I would much prefer to have this all handled automagically by systemd, > > but I need guidance on how to configure it. If it weren't for the power > > question, I know I can just use automount (and have managed to get this > > far on my own), but I don't know where or how to insert the power > > scripts. My reading of the systemd docs leads me to think that > > ExecStart/Stop might be the way, but where do I put this? Do I need a > > specific foo.mount unit (I'm currently using /etc/fstab)? > > > > poc > Hi, > > I don't really understand your problem. Do you want to unmount the > backup drive whenever it's not in use? There is the mount option x- > systemd.automount,x-systemd.idle-timeout=5s (man systemd.mount) to > mount/unmount on demand. That's not the issue. I know I can automount/unmount and this is already working. However I also want to power down the external drive after unmounting, and power it up again before mounting. I have my own script to handle the power up/down and that also works. What I haven't managed to do is join those two elements together. > Can you share your fstab entry for your backup device? UUID=6cb66da2-147a-4f3c-a513-36f6164ab581 /raid ext4 rw,noauto,user,x-systemd.automount 0 0 As I said, this in itself works fine, as long as I leave the drive permanently powered on. poc ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Guidance on automount/unmount for external powered devices
Am Donnerstag, dem 11.03.2021 um 11:00 + schrieb Patrick O'Callaghan: > Apologies in advance if this is a FAQ, or if there is a more > appropriate list for this question. I'm looking for a step-by-step > guide for the following situation: > > I have an external 2-bay USB3 drive enclosure, configured as an MD > Raid-1 device. This works without issue. > > I normally only use the device for nightly backups, so would prefer to > leave it powered off until needed. > > I have scripts to power it up (creating the appropriate /dev/md entry > and mounting the drive) and down (unmounting, removing the /dev/md > entry and sending a magic signal to the USB device so it powers itself > down after 30 minutes). > > Unfortunately a system reboot always leaves it in the 'powered up and > present in /dev/md' state, so I have to manually run the power-down > script every time I reboot. This is inelegant. > > I would much prefer to have this all handled automagically by systemd, > but I need guidance on how to configure it. If it weren't for the power > question, I know I can just use automount (and have managed to get this > far on my own), but I don't know where or how to insert the power > scripts. My reading of the systemd docs leads me to think that > ExecStart/Stop might be the way, but where do I put this? Do I need a > specific foo.mount unit (I'm currently using /etc/fstab)? > > poc Hi, I don't really understand your problem. Do you want to unmount the backup drive whenever it's not in use? There is the mount option x- systemd.automount,x-systemd.idle-timeout=5s (man systemd.mount) to mount/unmount on demand. Can you share your fstab entry for your backup device? BR Silvio ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Guidance on automount/unmount for external powered devices
On Thu, 2021-03-11 at 12:08 +, Dave Howorth wrote: > On Thu, 11 Mar 2021 11:00:04 + > Patrick O'Callaghan wrote: > > Unfortunately a system reboot always leaves it in the 'powered up and > > present in /dev/md' state, so I have to manually run the power-down > > script every time I reboot. This is inelegant. > > There may be better ways, but could you use an @reboot crontab entry > containing something like > > sleep 30 && do-whatever-you-need-to-issue-the-power-down I wasn't aware of the @reboot crontab option. Certainly a viable alternative, thanks. poc ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Guidance on automount/unmount for external powered devices
On Thu, 11 Mar 2021 11:00:04 + Patrick O'Callaghan wrote: > Unfortunately a system reboot always leaves it in the 'powered up and > present in /dev/md' state, so I have to manually run the power-down > script every time I reboot. This is inelegant. There may be better ways, but could you use an @reboot crontab entry containing something like sleep 30 && do-whatever-you-need-to-issue-the-power-down ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
