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With Apple now supplying Fusion Drives in their current generation Mac Minis & iMacs we thought it was about time we let classic Mac Pro users know how to get in on the action. A Fusion Drive is basically a software based SSHD (hybrid drive), it uses software to combine a regular, slower but higher capacity, HDD and a modern, faster but smaller capacity, SSD or flash storage module into one drive. OS X will then control which drive your files end up being stored on, all files will be stored on the SSD until it’s full, after this point your system will store only your most used files on the SSD.
In theory, this set up should manually optimise the way your files are stored, meaning the best possible storage performance without lifting a finger. Now, one may ask, surely a hardware based SSHD is superior to the software based Fusion Drive? Well, the general consensus is that Apple’s proprietary Fusion Drive software is in fact a superior file management system to those used in SSHDs.
With all this in mind, lets talk about how a Fusion Drive can help system performance. Any file stored on an SSD will see performance benefits over those stored on a HDD, quicker loading to RAM/CPU, faster application load speeds, faster OS X boot times, the list could go on. Basically, if something is important to your workflow, be that your OS, favourite applications, often used plugins or sample libraries, then they are best off stored on an SSD. Of course, this requires manual organisation, Fusion Drives attempt to alleviate this by analysing exactly what it is you use most often and then storing that on the SSD for you. The crux of the argument for a Fusion Drive? Pain free optimal storage performance.
So, what do you need to create a Fusion Drive?:

  • 1 or more HDDs.
  • 1 or more SSDs or flash storage modules.
  • The instructions below.

Combine an SSD & HDD to create a DIY Fusion Drive in OS X With Apple now supplying Fusion Drives in their current generation Mac Minis & iMacs we thought it was about time we let classic Mac Pro users know how to get in on the action. Fusion 11.5.6 not supported on Mac OS 11 Big Sur Beta Trying to start Fusion and get the following: Thought by installing the latest version of Fusion, it would be suppported, especially since the tech preview has been out for several months. If you’re using a version of OS X older than Yosemite, when typing the address on your Mac you’ll need to type smb:// first in the Connect to Server dialog box – for example, smb://192.168.1.2.

How to create a Fusion Drive in OS X:


Ok, lets get into this proper. Here’s the step by step guide to create your Fusion Drive. Of course you will need a HDD & SSD installed in your system before starting the process.

  1. Make sure that both your SSD & HDD are installed in your Mac Pro using the SATA or PCI-e bays.
  2. This process will destroy any data currently stored on your SSD & HDD, so please ensure they are backed up properly if there is data on them that you do not wish to lose.
  3. Boot into OS X (if you would like to use your new fusion drive as the boot drive then you will need to boot using an OS X USB Recovery Partition, if you need to create one follow this guide).
  4. Once you are booted into either OS X or your OS X USB, open Terminal. You can find it at the following path: ApplicationsUtilitiesTerminal.app.
  5. Inside terminal enter the following command: diskutil list
  6. All of the drives in your system will now be listed, each will reveal in mount point in the following format: /dev/disk#
    • The ‘#’ will be a number which is assigned to each drive by OS X. Make a note of the mount points for both the HDD & SSD that you wish to create the Fusion Drive with, you’ll need them shortly.
  7. We will now create the logical volume group using Core Storage, this will perform as a container for the drives that are being fused. You will need the mount points that you noted down in the previous step. Enter the following command into terminal: diskutil coreStorage create LOGICAL_VOL_GROUP_NAME DRIVE_1 DRIVE_2
    • In place of ‘LOGICAL_VOL_GROUP_NAME’ select a name for your new Fusion Drive.
    • In place of ‘DRIVE_1’ & ‘DRIVE_2’ use the mount points we jotted down before in the ‘/dev/disk#’ format.
    • So if you decide to call your Fusion Drive ‘Fusion Drive’ & your disk mount points are ‘/dev/disk1’ & ‘/dev/disk2’ then the command would look like this: diskutil coreStorage create ‘Fusion Drive’ /dev/disk1 /dev/disk2
      • Make sure you include the apostrophes around the name, otherwise the command wont work
  8. We will now create the logical volume, this is where your data will be stored. To complete this step we will require your LVG UUID, this is an identifier assigned to storage groups by OS X. After completing the previous step, Terminal should now display your LVG UUID as ‘Core Storage LVG UUID’. Make a note of the ID and enter the following command: diskutil coreStorage createVolume lvgUUID type name size
    • ‘type’ refers to the format of the drive, for OS X Extended use ‘jhfs+’. Don’t use a different type unless you know exactly what you’re doing.
    • ‘name’ refers to the name of the Fusion Drive that you set in step 7.
    • ‘size’ refers to the size of the Fusion Drive, use ‘100%’ unless you know exactly what you’re doing
    • If your lvgUUID is ‘12345678-1234-1234-1234-123456789123’, type is ‘jhfs+’, name is ‘Fusion Drive’ and size is ‘100%’, then you would enter: diskutil coreStorage createVolume 12345678-1234-1234-1234-123456789123 jhfs+ ‘Fusion Drive’ 100%
      • Again, don’t forget the apostrophes around the Fusion Drive name

There you have it, you’re now the proud owner of a brand new DIY Fusion Drive for your classic Mac Pro! We have included our Terminal log below incase you would like to refer to it:


A Fusion Drive gives you the best of two worlds: the high storage capacity of a traditional platter-based hard drive, and the speed boost of a solid-state drive, without you having to manually manage files. Apple offers the Fusion Drive as build-to-order options for the $799 Mac mini and the upcoming iMac, but if you are willing, able, and have the parts, you can make your own Fusion Drive.

To build a Fusion Drive, you need to use the Terminal. We’re going to lay out the commands you need in a way that most can understand, and you don’t need to enter a lot of them. However, a warning to anyone who has never used the Terminal: Working with the Terminal isn’t as simple as a graphic interface, as spelling counts and you don’t always have a nice list of commands. You also need to be using OS X 10.8.2 or later.

Gather your drives

You need two drives to make a Fusion Drive, and if you want to get the speed boost, one should be an SSD. In our setup, we used a Hitachi 1TB 2.5-inch hard drive (the one that ships in a Mac mini) and a 240GB OWC Mercury Extreme Pro 6G SSD.

Apple chooses the drives they use based on extensive testing, which is why they recommend buying a Fusion Drive at the point of purchasing your Mac. Apple does not support users who have built their own Fusion Drive. (In our lab experiments, I was able to create a Fusion Drive with two flash thumb drives.)

Back up your data

If you have anything that you want to keep on either of the drives, now is the time to back it up: linking the drives with CoreStorage, the technology behind the Fusion Drive, will erase them completely. If you need help with backing up your data, check out our guide on how to back up your data with Time Machine or, if you don’t need to save absolutely everything on your drive, our more generic guide on backing up your data.

Bust open Terminal

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The Disk Utility application (Application > Utilities > Disk Utility) doesn’t support the management or creation of Fusion Drives in its graphical interface, and knowing Apple, it might not ever support it. To create the Fusion Drive, we’ll use Disk Utility, but the command line version that comes with every Mac. (Learn more about the Disk Utility command line.)

If you aren’t going to include the drive you booted from in a Fusion Drive, you can open the Terminal app (Applications > Utilities > Terminal). This would be the case, say, if you’re using a Mac Pro with multiple drive bays, since you can format them both externally.

If you want to include your current boot drive as part of the Fusion Drive, you’re going to need to boot into recovery mode and run Terminal from there. The CoreStorage process used to “fuse” the drives also formats them, and you can’t do that to a drive used as the boot drive. You can boot into recovery mode by holding Command+R when starting up your Mac, and open Terminal from there.

One last thing to note: If you’re using a Mac currently in Apple’s product line, such as the 13-inch Retina MacBook Pro or the new Mac mini, you can’t use just any old install disc as a boot disc. Those machines require a special version of Mountain Lion that’s not yet in the App Store. So in this circumstance, recovery mode is your best bet.

Make the drive

Once you have the Terminal open, you’re ready to get to creating the Fusion Drive.

List the drives you system can see. Use the following command to list the drives attached to your system:

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diskutil list

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This will list the drives like this:

The drive mount points are labeled /dev/disk#. Make a note of the mount points for the disks you want to make into a Fusion Drive. In our example, /dev/disk0 is the boot disk, while /dev/disk1 and /dev/disk2 are the SSD and hard drive (respectively) that we want to put together as a Fusion Drive. An easy way to tell drives apart is by their size and their name. Make sure you don’t confuse them, as the Terminal doesn’t give much warning before wiping your drive.

Create a logical volume group. Let’s create a CoreStorage logical volume group, the pool of data that will be made from the combined space of our physical drives. Use the following format of the diskutil command:

diskutil coreStorage create nameYourThing drive1 drive2

Mac

Going off the example using /dev/disk1 and /dev/disk2 as the drives to combine, I simply type:

diskutil coreStorage create myLogicalVolGroup /dev/disk1 /dev/disk2

When the process is done, your logical volume group should be completed and the command will finish by presenting you with a unique identifier for the group, which you should copy to your clipboard. It should look similar to this:

Create a logical volume. Now that we have a logical volume group, we can create the logical volume, what your Mac will recognize as a single drive. Use the following format of the diskutil command:

diskutil coreStorage createVolume lvgUUID type name size

  • lvgUUID is the unique identifier you copied from the previous step.
  • type use Journaled HFS+ (typed as jhfs+).
  • namecan be whatever you want to name the drive (traditionally “Macintosh HD”). Make sure you use quotes if there’s a space in the name.
  • size is how much of the “pool” that you want to make into a drive, using the following suffixes: B(ytes), S(512-byte-blocks), K(ilobytes), M(egabytes), G(igabytes), T(erabytes), P(etabytes), or (%) a percentage of the current size of the logical volume group.

Going off my previous example, my command would look like this: Glock date code.

https://legal-logdeposit-florida-in-fho-is-online-poker.peatix.com. diskutil coreStorage createVolume 50B457C3-ADC6-4EDC-9ABA-FD8C6EEDE69A jhfs+ 'Macintosh HD' 100%

That will create a volume named Macintosh HD, and fill the entire logical volume group (100%), or all the space on the two drives.

Enjoy!

Once that command is done, you have your Fusion Drive. You can now restore Mountain Lion back onto it, or do whatever you want. The only thing to remember is that they both need to be connected at the same time to work.

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