Short answer is no. Fusion drive has its own algorithm to determine which individual file goes to which drive, based on frequency of access. It doesn't offer any interface to configure the location of files. Moreover, it doesn't even list out which file belongs to which drive. In fact, the only way to know where a file is, is to read the file while the user monitor data flow from both drives.

1. Best Linux For Imac
2. Fusion Drive Review

I don't see why you need to force the entire copy of OSX onto SSD. Frequently used portions of the system, such as start up routine, are most definitely on SSD. There is no reason to have the icons file of some hidden app that an user never use also forced onto SSD. If you want the entirety of system files on SSD against all, you will need to run the two drives desperately, in the lame way. Then you can put /Appications and /Users in appropriate drives. If you want to put certain files always on HDD. You can create a partition on HDD, outside of Fusion Drive.

Files on this partition will never end up in SDD. Vice versa does not apply.

Has anyone been successful at doing this. I have not, actually I tried using bootcamp and created a partition on my Fusion Drive and could not install windows on it. I called Apple Care to help me with this issue and 2 Sr specialist later and a ton of Terminal commands I had to rebuild my drive back with all the fusion technology. I am now scared to attempt trying it I have a late 2015 Imac 5K with a 2tb Fusion.

The problem exists on where the Windows OS is placed on the drive. I don't think Apple has figured this out yet foe Windows 10. Anyone do this I would like to her success stories before I attempt again. Thanks in advance.

Has anyone been successful at doing this. I have not, actually I tried using bootcamp and created a partition on my Fusion Drive and could not install windows on it.

I called Apple Care to help me with this issue and 2 Sr specialist later and a ton of Terminal commands I had to rebuild my drive back with all the fusion technology. I am now scared to attempt trying it I have a late 2015 Imac 5K with a 2tb Fusion. The problem exists on where the Windows OS is placed on the drive. I don't think Apple has figured this out yet foe Windows 10. Anyone do this I would like to her success stories before I attempt again.

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Apple uses a Wikipedia:RAID alternative called CoreStorage to merge the SSD and HDD into a single logical volume (sold as Fusion). We need to remove this volume, so. After running the Boot Camp Assistant, partitioning the Fusion drive, and starting up in the Windows installer, you might not be able to find the BOOTCAMP partition.

Fusion Drive Review

Thanks in advance.