I recently wanted to install OpenVPN to my OMV v4.1.23-1 and consulted a YouTube video of TechnoDadLife (Link follows). Anyways, after the first steps I had to reboot the system only to find that my Mirror RAID1 (it was encrypted using LUKS) was gone. It's also gone in the encryption section.
I have read through a couple of threads here, but was yet unable to mount even a single of the two disks, let alone the RAID. After having read these threads, I assume my manual edit of the config.xml and following omv-mkconf fstab was the reason for this error, though I'm clueless why. The exact procedure can be found at this timestamp of the video: https://youtu.be/nMthOobE-8g?t=172 - nothing really complicated especially up to this point.
When I try to create a new file system, OMV says it'll format the drive(s), which of course I do not want to happen.
I have already tried to reactivate the RAID by using mdadm -assemble, here's the output:
Here's the output to the Degraded or missing raid array questions
So the two drives for the RAID are /dev/sdd and /dev/sde, both with 4TB capacity (see screenshots below as well). And as said, encrypted using the LUKS / the encryption plugin. Worked perfectly well until this reboot...
Somehow I have the feeling that OMV "forgot" that these drives are encrypted and needs to be told and afterwards would be fine to recreate the RAID, but I do not know how.
Here's a screenshot of file systems with the missing RAID:
And here's one showing the 5 disks of my server. A 128GB SSD as system drive sda, two 8TB drives sdb & sdc (both LUKS encrypted as well) and the two 4TB drives sdd&sde which used to be the LUKS encrypted RAID: