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35a32c5
(Get the code!)
Just an update for everyone interested. I solved my issue by one(or multiple) of the following steps. Failing my sdc disk, pasting new superblock, writing new boot sector, partitioning again and adding the disk back. So I am still not sure what caused my problem except I am fairly sure that my 2nd disk had a previous superblock that confused things. Disk was used in another system as part of a md array. What showed me the issue was "mdadm -Es". It showed me two arrays that can be assembled.
Sorry I can not be more helpful except you should run mdadm -Es early on and avoid a lot of tail chasing. If you are seeing an array you did not expect that will cause the problems with "--incremental" when booting up.
Before I fixed the issue I was seeing this:
root@jamaica:~# mdadm --examine --scan
ARRAY /dev/md0 UUID=5551e210:
ARRAY /dev/md0 UUID=4795c86a:
After:
root@jamaica:~# mdadm --examine --scan
ARRAY /dev/md0 UUID=4795c86a:
Also worth noting is my superblock is 0.90.