May 30 16:09:09 Ferrum kernel: mdcmd (36): check correct
May 30 16:09:09 Ferrum kernel: md: recovery thread: recon P ...
May 30 16:09:05 Ferrum emhttpd: shcmd (53): /usr/local/sbin/mount_image '/mnt/user/system/docker/docker.img' /var/lib/docker 10
# Share exists on disk1
Perfect storm. The system share (which is holding the docker image) only exists on the array (parity protected), and you're currently running a parity check.
Ideally, you want the docker.img file to be on the cache drive. The share is set to be cache prefer, but the system can't move any file that's in use, and additionally you have the share set to use "cache" pool, but the drive is part of the "nvme" pool. Set the cache pool it's using to be "nvme". Disable the docker service (Settings, Docker), then run mover. When it's done re-enable.
Alternatively instead of running mover, just delete the image and reinstall via Apps - Previous apps.