First, I think I did this to myself but I'll try my best to recreate the sequence of events.  Last night I was preparing to copy my share data to an external (unassigned) drive for backup.  I was reviewing the filesystem and noticed that I had a /system folder on one of my array disks.  I thought this was odd because my system share is set for Cache as primary storage and Array as secondary.  There is plenty of available space on my Cache so I concluded that the /system folder on the array drive was left over from some previous evolution and wasn't needed.  I confirmed that the dates on the files in the array system folder were several months old.  Furthermore, there was a system folder on my cache drive with with files that were modified today.

 

Assuming I didn't need it, I moved the array system folder to another location on the array.  The destination doesn't use the cache and is excluded from my backups.  I then proceed with backing up my share data to the external drive.  I let it run all night and while I was at work I got a notification that a parity check had started.  That was odd so when I got home I checked the GUI and saw that unassigned drive had an icon next to it saying "reboot" (I use the unassigned devices plugin).  I've never seen that before so I paused the parity check, stopped the array and rebooted.

 

After reboot I'm missing all my docker apps and VMs.  I copied the /system back where I moved if from and stopped/started the array.  Still no luck.  I stopped there, and thought I'd reach out for help.  I do use Appdata backup and those backups seem to be current.  Happy to provide any information that will further help troubleshooting

nas-diagnostics-20240220-1813.zip

Docker image is empty, so easiest thing to try first is Apps, Previous Apps.  Check off everything you had before and hit install.

 

VMs I'll let someone else better suited to assist with that.

I've been looking at my director structure.

• There's still folders for all my dockers in /mnt/cache/appdata
• There's still folders for all my vm's in /mnt/cache/domains

Are you saying if I reinstall the dockers it will use the previous settings and not start over from scratch?  That's good news.

https://docs.unraid.net/unraid-os/manual/docker-management/#re-create-the-docker-image-file

 

https://docs.unraid.net/unraid-os/manual/docker-management/#re-installing-docker-applications

Thank you for all the help, I got it sorted out.  I stopped the docker and vm services.  Then I was able to restore the /system directory to its default location on /mnt/cache.  That put the previous versions of system\docker\docker.img and system\ibvirt\libvirt.img back in their original locations.  Once I started the docker and vm services back up, everything was back to normal.