Well now I’ve done it - Fusion Drive, APFS

[kepardue]

So, I was going to revert back to Sierra since it seems like I’d have to go back to HFS+ anyway (current gen iMac with Fusion Drive), but after failing to erase the drive to reformat it as HFS+, somehow I seem to have eliminated my container for the main drive and the SSD. I tried to reassemble /dev/disk0 and /dev/disk1 with CoreStorage in terminal, but that doesn’t seem to work. I’m realizing my idiocy, but curious if anyone has any pointers for how I can:

1 - completely wipe out the partitions and any CoreStorage configuration that’s already there
2 - set up the partition for the SSD and the physical hard drive as HFS+
3 - create the Core Storage grouping so that I have a viable drive to install Sierra onto.

 

[kepardue]

As an update, I realize I shouldn’t have even posted. I pieced together how to fix the issue by following a combination of this post: https://forums.macrumors.com/thread...on-after-bootcamp-fail.2053659/#post-24746581 and this one http://www.wurst-wasser.net/wiki/index.php/How_to_erase_and_create_a_Fusion_Drive. I’ve got macOS Sierra installing now, and will patiently wait for High Sierra to drop on Monday.