Starting with Kernel 5.2.0, all HDDs conncted through AACRAID (Adaptec 5405) aren't anymore recognized via "generic sg*". > [ 2.324655] sd 0:0:0:0: Attached scsi generic sg0 type 0 With Kernel 5.1 and older, this works fine and all HDDs are also mapped to /dev/sg[1234].
Closing.