does macOS High Sierra work with fusion drive?

Yes it's true but it works just fine on Fusion drives. APFS will be supported on Fusion drives in a future release.

littleclown wrote:

Get a notice to upgrade weekly but the last line of the info stated only works on digital drives not Fusion

High Sierra does not support APFS on Fusion drives at this time. However, it runs on Fusion drives without any problems. I've been running High Sierra on iMacs with Fusion drives since before the initial public release.

macOS High Sierra - Technical Specifications

But note this restrictionrelated to APFS stated in the link:

"Apple File System

Requires a Mac with all-flash internal storage."

macOS Sierra will install as HFS+ on your Fusion drive, and preforms trouble free as indicated above.

Support for APFS on Fusion drives is in the works and coming, but not publicly available at this time.

Prepare for APFS in macOS High Sierra - Apple Support

Yes, it's true.... It's the APFS / Fusion Drive combination that it is not compatible with.... must reformat your drive in order to remove APFS.

Kinda bad planning on Apple's part IMHO.... :-(

What problem do you think you have? High Sierra works with your drive. Just because it does not change the file system does not mean it doesn't work. It just means it does not change the file system.

Without all the details of exactly what happened it's impossible to say. But many people are running High Sierra on Fusion drives. Just without APFS.

First, APFS is a benefit to SSDs. Second, it's not mentioned because it won't convert a Fusion drive to APFS.

The processing time for rendering 3D objects or high end architectural renderings increased substantially even with all application software and plugins updated to the latest versions.

I'm running a iMac (27-inch, Late 2013) with

3.5 GHz Intel Core i7,

32 GB 1600 MHz DDR3 and

NVIDIA GeForce GTX 780M 4096 MB.

with a 3TB Fusion Drive

Yes, High Sierra runs but because of caching and file structure it does not preform as quickly as Sierra does. I have all programs and OS files on the Fusion drive and all data files on a WD Black 4TB external on the USB connection. If anything I feel that the latest OS+ update should run faster than the older version OS. They always have in the past.

When I installed High Sierra on my iMac back on Oct. 3rd it loaded and when the system restarted had a bog circle with a line thru it. Called Apple Care and they sent a tech to replace my fusion drive. After tech installed the rive downloaded High Sierra and rebooted it acted exactly as it had with the old fusion drive. Have been running Sierra ever since waiting for the upgrade fix so I can run High Sierra. Get a notice to upgrade weekly but the last line of the info stated only works on digital drives not Fusion

Yes if you are capable of reformatting the drive it will run but if you cannot it will bomb when it tries to restart the computer after the update. I have tried on three occasions to reinstall on my unit and have had to reinstall from a time capsule backup to Sierra to get the machine to run. I am not comfortable with the suggestion to reformat the drive and then only pick the stuff you want on your machine from your time capsule. Might lose too much stuff in the transfer. That is why I will continue to wait for the fix and hope it works so I can just after install just copy everything from my time capsule and be good as gold.

You're welcome. There's a lot of details I'm sure that are missing. I can't speak to what was done or why. I can say I have had no problems with High Sierra on Fusion drives nor have most people.

I'm curious as to what problem you are having as well. I've been running High Sierra since June on iMacs with Fusion drives. Mine seem fine.

I never reformatted my drives. I went straight from Sierra to High Sierra. Whatever issue you had had nothing to do with High Sierra on Fusion drives.

I find it hard to believe that in a third update to a new OS that something as major as working "correctly" with as many iMacs that have been sold and that are still being sold with Fusion drives that this is not a top priority on the things that need to be solved/corrected. Sure we have emojis that have facial recognition (cute) but when it come to having a computer that you purchased to do a higher level of computing you would think that Apple would have had an answer for this problem by now. I hate to say it but, I have a feeling that if Steve was still around, I don't think that we would have this problem or as many of the current OS problems getting out to the public. If the user experience in the retail stores is top priority having the installed base being able to use their product to the fullest should also be at the top. That is how we can keep the the number of people who support the products happy. One of the first rules in retail.