Hi Roland,
I'm now in the data center for the morning for some testing. Here is the output from the /usr/lib/fai/fai-disk-info command:
# /usr/lib/fai/fai-disk-info sda sdb
This configuration is for two RAID arrays on the same controller (one RAID 1 pair for the OS disks - sda, another RAID 6 array for scratch storage - sdb). lsblk shows both arrays as expected. Any suggestions of other things to try, or additional output that would be helpful?
Best, Dave