Chapter in this post:
The benefits of Apple Fusion Drivewith which combine an HDD and an SSD to achieve faster read and write values, you can find here. At the end of the article, instructions were also announced to give you a guide Create Fusion Drive yourself can. This will now be delivered later; delayed, but at least;) I scooped through some sources to prevent possible false reports, and also found a video whose screenshots I use as images. I will also include the video (in English) in its entirety at the end of the post.
Update 19.11.2017/XNUMX/XNUMX: Procedure under macOS High Sierra
A reader asked me today how he should do that with the FusionDrive in detail and whether the Mac automatically recognizes them after installing the two disks and creates a Fusion Drive. Unfortunately - or fortunately - it doesn't, because you can decide for yourself what to do with a new hard drive.
For me, however, the email was reason enough to look again whether something else has happened in the Fusion Drive area with High Sierra, or whether only APFS was the novelty of the hour (at least with regard to the disk utility). The short version is: To create a Fusion Drive you still need the help of the terminal. I checked through the utility and selected two hard drives that could have been "merged", but there is simply no option for it. So you still have to use the terminal, as described below, to create a Fusion Drive yourself.
For everyone interested, here is the short version of how to proceed, for example if you want to replace the internal hard drives with larger ones and then let the two new ones run as a fusion drive:
I always recommend a 1: 1 backup with Super Duper or Carbon Copy Cloner to do, because TimeMachine also said before that my backup would be useless. If I hadn't had a 1: 1 backup on another hard drive at that moment, all my data would have been gone. So it is better to buy an external USB hard drive (2,5 inch) and make one backup too many than one too few.
You can already find some previews in the article linked above. Here I just want to give two more tips that are important before you start creating a Fusion Drive:
After executing the commands listed below, it is also necessary to reinstall the operating system. You can easily do this using the utilities (cmd + R) that you have to go into anyway to create the Fusion Drive. If in doubt, you should have a boot USB stick on hand. I have also described how to create it in the form of instructions: click here.
Now let's get to the heart of the matter and create a so-called one from a rotating disk and a flash drive Fusion Drive with coupled storage and intelligent data and program management. To do this, a backup is first made, as highlighted above, and then the Mac is restarted.
The heading says almost everything: So you restart the Mac or switch it on first. When booting the operating system, hold down the Command key and the R key at the same time. Depending on the system and age of the Mac, it can then take a while for the Apple logo to appear. If the Apple logo appears, you can release the buttons again. Then you will be shown some of the system's utilities in a window.
We do not need the utilities displayed in the window, but work with the Port further. You should be able to open this via the menu bar of the “Utilities” menu (upper edge of the screen). Take a little time for the following steps, because now it's down to the nitty-gritty, programming commands and thus also the correct spelling! Ready? Let's go.
In the terminal you give first disktil list a. This will ensure that an overview of your hard drives is generated and displayed. Depending on whether and how you have created virtual drives, the corresponding number will be listed. The two real plates are of course most important for the following steps. If in doubt, look for the largest values for "SIZE" at the top of the list, ie 128 GB, 500 GB, 1 TB, etc. - depending on the Mac model.
From the overview you can see the names of the records, which you can find in the "IDETIFIER" column: logically, these are mostly disk0 and disk1. But if you are installing and removing disks multiple times, plugging in and uncoupling and creating virtual partitions, it can be different. In the standard case, however, it is as described; Especially the HDD is easy to find because it is standard Macintosh HD heißt.
So you now have the names of the two plates - that takes you to the last line of the overview, where –Bash-3.2 # should stand. There you now enter another command. This is discuss coreStorage create Name / dev / disk0 / dev / disk1. The name, simply called "Name" in the example code, is assigned by you individually. In the example video (see below) “Macintosh” is assigned. After entering the command, you will start it - the plates will then be deleted.
In the picture above you can see the various steps of your command. You will get an alphanumeric code in two lines (Discovered new Logical Colume Group, and Core Storage LVG UUID:) Mark this combination of characters and copy it to the clipboard. We'll need it again in a moment.
In the next command, which is: discuss the coreStorage createVolume UUID jhfs + "Name"100% . Two comments on this: Instead of UUID, you insert the alphanumeric code. Instead of Name (yes, it is written in the quotation marks) you choose your Fusion Drive name, again "Macintosh HD" or something like that. To illustrate the whole thing again, here is a picture:
And basically you're through now. You return to the utilities window and reinstall the operating system (second item in the list). If that is done, you can now use the merged storage medium to store programs and data.
Of course, I not only used the video in question as research material, but also other instructions. Some of these are very deformed and therefore complicated. In addition, it is not uncommon for them to state that one should calculate a value of the memory capacity with this and that formula in order to then insert it into the last command. I find that too difficult if you want to use both platters 100 percent as a Fusion Drive. Hence the alternative given above with the value 100%. You don't have to make it harder than it actually is;)
I hope this guide was understandable and effective. If you have any questions or something is unclear: then write a comment. I would also like to hear from you if everything goes well and this Step by step instructions for creating the Fusion Drive was successful! During my research I also noticed one more thing: In the worst-case scenario, I still need instructions on how to dissolve the merger - I'll write them in the next few days;)
After graduating from high school, Johannes completed an apprenticeship as a business assistant specializing in foreign languages. But then he decided to research and write, which resulted in his independence. For several years he has been working for Sir Apfelot, among others. His articles include product introductions, news, manuals, video games, consoles, and more. He follows Apple keynotes live via stream.