How to create a Fusion Drive
Info:
1. Always first Backup all data on an external drive. Best usage CCC for a bootable system.
2. Prepare for all steps to follow and be sure to understand the procedures fully.
When you setup a Fusion Drive (conventional Hard Drive and SSD Fused together) both drives will be erased and can only be used (both) to each 100% for such setup.
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Setup:
A. Startup from an external hard drive since, when you start to set the Fusion system up, NOTHING can run on the drives you want to fuse.
You also can (and I suggest to do so) reformat both drives first via "Disk Utility" to be sure to have a clean system.
B. Open "Terminal" (inside the Utilities Folder or via the top menu if you are using the Restore Disk form one other Drive).
C. At the insert point enter: diskutil coreStorage then hit "Enter" (also known as "return").
D. The Terminal should respond with the following:
E. Select the Drives you want to fuse, to do that enter into Terminal diskutil list followed by "Enter" (also known as "return"). The next window should look similar to the following:
F. Take note of the first line (/dev/disk#) whereas the # indicates the number of which disk is which. This is important for the next step. Be sure you select the right ones.
G. Now enter into the Terminal diskutil coreStorage create myLogicalVolGroup /dev/disk# /dev/disk#whereas # represents the number of the drive you want to select to be fusedfollowed by "return".
The following window shows after a short time:
H. Take note of the identifier for the "discovered new Logical Volume Group" or the "Core Storage LVG UUID" both are the same ID.
I. Now enter diskutil coreStorage createVolume50B457C3-ADC6-4EDC-9ABA-FD8C6EEDE69Ajhfs+ "Macintosh HD" 100%whereas (50B457C3-ADC6-4EDC-9ABA-FD8C6EEDE69A) must be the number you wrote down from step H. When you now hit "return" the system will setup the fused drive.
The next window should show:
J. You are done. Now install the operating system, your Apps and your files back from your backup onto the newly created fusion drive and you will enjoy a speedy process.
Short Setup Info:
Enter into Terminal: diskutil list
Note Disk ID /dev/disk# to be fused
Enter into Terminal: diskutil coreStorage create myLogicalVolGroup /dev/disk0 /dev/disk1
Note "Logical Volume Group" ID (five mixed Numerical and Letter Groups)
Enter into Terminal: diskutil coreStorage createVolume(five mixed Numerical and Letter Groups)jhfs+ "Macintosh HD" 100%
Done
Congratulations, Enjoy.