Is my Fusion 2tb correct?

[Oktober]

Over the christmas period I wanted to do a clean install of OSX on my late 2015 27" iMac as I had a few issues, chiefly among was my previously used USB installation of OSX High Sierra, which was corrupt somehow and would not install. I was stuck in spinning world screen internet recovery.

I phone my local computer shop and they re installed OSX Monterey, however, I am not sure they have used the fusion drive correctly? See image attached. If it was correctly used would it not appear as one drive than two? also when I show hard drives on the desktop there are two drives.

Would this indicate the Fusion is not set up correctly?
How do I fix this? maybe this Apple guide?
https://support.apple.com/en-us/102226#:~:text=Fusion Drive, a storage option,working as a Fusion Drive.

Thanks for your help

 

[Fishrrman]

Egads, what a mess.

It looks to me like they split the fusion drive and installed the new OS onto the SLOW internal platter-based hard drive.

This is NOT a good thing.

My advice:
1. Get your Mac back
2. Ask for help HERE, and you will receive BETTER help on how to proceed.

Why didn't you try this yourself?
Do you have a backup of any kind?

 

[MacCheetah3]

Over the christmas period I wanted to do a clean install of OSX on my late 2015 27" iMac as I had a few issues, chiefly among was my previously used USB installation of OSX High Sierra, which was corrupt somehow and would not install.

This was probably the infamous certificate expiration problem. it’s commonly encountered when using archived installers. For many years I archived every major Mac OS X installer. However, after discovering they expire and would need to be occasionally redownloaded anyway, I stopped that practice.

With that said… Because you have a functional Mac again, you can now (re)download a fresh macOS/Mac OS X installer, including older versions with updated certificates:

How to download and install macOS - Apple Support

Download and install current or previous versions of the Mac operating system on compatible Mac computers.

support.apple.com

Your iMac supports Mac OS X El Capitan (v10.11) through macOS Monterey (v12.7.2). So, you have options, whether it be for preference or necessity (i.e., compatibility). EDIT: Corrected this range.

Afterwards, generate fresh USB installation media:

Create a bootable installer for macOS - Apple Support

You can use a USB flash drive or other secondary volume as a startup disk from which to install the Mac operating system.

support.apple.com

Next/Lastly:

How to fix a split Fusion Drive - Apple Support

If your Fusion Drive appears as two drives instead of one in the Finder, it's no longer working as a Fusion Drive. Here's how to fix it.

support.apple.com

 

[Oktober]

thank you for the comprehensive reply’s. I have since used that apple split Fusion Drive guide and re- joined the two ‘drives’ together. Reinstalled osx Monterey and so far so good. It now displays a Fusion Drive rather than two devices. When the iMac started to download install six again it said 2hours 20mins then jumped to 3hours 16mins. In the end it took about an hour.

I did not know the usb osx install would expire?? Otherwise I would not of had a problem. So if I want to do a refresh again I will make a new usb installer at time rather than far in advance.