Docker needs to be manually started after reboot

[www_creedthoughts]

For various reasons, I find myself rebooting my server a couple times a week. Once the system restarts, I need to restart the docker, by un-enabling it and then re-enabling it. The docker image is stored on a drive outside the array, which auto-mounts at startup using the "Unassigned devices" plugin. My hunch is that the docker tries to start before unassigned devices mounts the drive. What can I do to change the startup order?