I have a RAID6 and it is not active. I had 6 disks and added a 7th one. I did grow the array and reshaping was finished. After rebooting the last disk was missing, the array was not active and I could not access SSH or Web-GUI. My OMV4 is on a seperate disk! I try to find out what's wrong.
I added the missing disk with mdadm --manage --add /dev/sdx.
The "new" disk showed up as spare and this triggered an automatic rebuilt.
After rebuilding I rebooted and got to step 1 where the array was inactive and the disk was not part of the array.
Now I have some questions.
1 - Is it possible that my OMV configuration is somehow broken and that would cause the Web-GUI and SSH not to be availabe?
2 - Is it possible that the last disk has errors that could cause this? It had several pending sectors and I copied it full so all of them where corrected and then the SMART status was green again and no error came up on short test.
3 - Why is the array not starting as degraded with one missing disk then?
4 - Is it possible that the last disk still has a filesystem EXT4 from previous usage and that this is causing the problem upon startup?
(Yes, I will change from RAID to snapraid as soon as possible.)