I have just migrated from a VMware VM to a physical install on my Gen8, and in the process switched from RAID to AHCI.
I'm getting strange issues with Plex clients not playing files and other odd goings on which may or may not be DrivePool related.
Also, I don't remember seeing multiple drives in disk manager previously, and I have some strange errors in the event logs.
One of the drives in disk manager (The drivepool drive) is also a strange size?
Hopefully these screen shots can shed some light?