RAID is healthy, I do not know if there are any controller logs and if so, where do I find them. I use Adaptec 5805.

I tried resetting all possibles settings to factory defaults using C-A-X, to no avail. I noticed that after resetting the default volume group did not disappear - not sure if it is ok.

I have a feeling that somewhere in the system there is a record of an old array, and it is trying to mount it as /dev/sda, and the new one as /dev/sdb.