Anyone with a Fusion Drive updated to Big Sur?

[Sciuriware]

Hi gandalf. I am in the same boat: Catalia and the APFS ‘destroyed’ the fusion drive on my 4K machine too. As I saw it, APFS uses a different index system and while it should be easy to use ahybrid version on an HDD the don’t do it, maybe because of some security flags in APFS - while we suffer. That is not the kind of ‘social contract’ I want with Apple. I pay, they support me
And I have contacted support at that time, they played ingnorance.

I am wary. Afraid. I have an external Thunderbolt SSD now, starts up in 32 secs flat. I have stayed with Catalina Up till now. But Safari is now breaking down with the new security requirements. So I have to use Firefox.
But then I hear that external booting will be stopped in the future by M1 And maybe other OSes. Now should I buy a new one??? Reluctant. . .

I hear other rumours than you.
First: APFS on a Fusion twin is considered to be slow, why: APFS is meant for SSD drives,
worse: APFS encourages several app's to perform multiple parallel I/O streams; unpleasant for HDD's.
My installations have upgraded smoothly until now: APPLE probably dislikes any other upgrade or installation method.
I read that bootable backups are possible on Monterey / M1 silicon, so, why the expectation that it will stop?
In all these forums I encounter all kinds of people with all kinds of problems that even you and I do not have.
Maybe APPLE does not like any non-standard use or addition to the hardware; otherwise I don't understand.
;JOOP!

 

[albertaka]

I made Monterey on an external SATA. It works, is reasonable fast. But I do not dare to clone it to the internal drive, but because I have CCC I will do it this week.
My only expected problem is that Lightroom 6.14 (perpetual) has an annoyance screen (a white bar), so you must go to a subscription . . .
For the rest it is much faster than Catalina.
Why I was reticent? Well, I have had bad upgrade experiences with Apple myself; and many people have had odd experiences too.
My only problem (I will look for a solution on the the Apple forum) is that the wireless magic mouse is not recognized in the settings pane (while it is used of course)