Cannot upgrade from Sierra to High Sierra on iMac Retina 5K 2016 with Fusion Drive

[CuamckuyKot]

Hey, guys!

I'm suddenly get stucked with upgrade from Sierra to High Sierra on Fusion Drive iMac Retina 5K.

After reboot installer told me "This OS can't be installed on this system".

I've read that there is no APFS support on Fusion Drive.

Does any of forum members has positive experience upgrading iMac with Fusion to High Sierra?

 

[Fishrrman]

High Sierra will run on an iMac with a fusion drive.
The installer will NOT convert the fusion drive to APFS, but it will leave it at HFS+.

I don't consider that a problem.
If you want to try High Sierra, install it with HFS+ and go that way.

If it was me, I'd just leave it on Low Sierra and be happy.

 

[dianeoforegon]

Does any of forum members has positive experience upgrading iMac with Fusion to High Sierra?

I would stick with Sierra for now. I have a fusion iMac late 2014. I defused my drives and have High Sierra on the SSD drive and put all my files on the HDD rotational drive. Works great.