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iMac 2015 + 2TB Fusion + Evo 850 2TB

Hi all,

I know this has been covered but I'm finding it difficult to get a consistent answer.

I currently have a late 2015 iMac 27" 4.0ghz 32gb RAM and use my computer primarily for audio. Pro Tools / Logic / Running big libraries such as Omnisphere / Kontakt / Superior Drummer 3.

I want my system as clean as possible and more importantly as fast as possible!

I have split my Fusion into 2 separate drives which is fast but I'm consistently running out of space even when running all projects and samples from my external Lacie 2TB via thunderbolt.

I have 2TB Fusion (Installed) - 2TB Samsung Evo 850 (Kicking Around) - Lacie Thunderbolt 2TB

For simplicity and speed should I:

1. Replace HDD part of the fusion with my samsung and RAID / make fusion drive with the internal flash if it's possible?

Would this work well and let me keep all software and libraries within my computer and run as fast as the lacie?

2. Abandon the HDD and Flash and put the Samsung inside as my bootable drive with everything on that?

3. Not bother putting the Samsung in?

Ideally if money wasn't an issue I'd have a 2tb flash drive and forget any other solution but this is way too expensive.

I'd love if the samsung and flash can look as one drive it would save me hassle everyday trying to plan where to run and save things. I don't move huge files around often and don't mind the wait. Just want optimum whilst performance doing audio based tasks which the fusion has not been up to. (Running huge audio libraries that are bigger than what the small portion of flash can store)

Thanks

You can create your own version of a Fusion Drive using the internal HDD and the Samsung SSD, but you would want the SSD used internally. If your iMac has space for a second drive then you should be able to get adapter cables.

You can also abandon the idea of a DIY Fusion Drive for an alternative way of using an HDD and SSD together that is pretty easy to do. See below:

How to use an SSD with your HDD

If you are going to use an SSD as a boot drive together with your existing HDD as the "data" drive, here's what you can do.

 

After installing the SSD you will need to partition and format the SSD using Disk Utility. Then, install OS X on the SSD. After OS X has been installed boot from the SSD. Use Startup Disk preferences to set the SSD as the startup volume.

 

Open Users & Groups preferences. Click on the lock icon and authenticate. CTRL- or RIGHT-click on your user account listing in the sidebar and select Advanced Options from the context menu. You will see a field labeled "Home dir:" At the right end you will see a Change button. Click on it. In the file dialog locate the Home folder now located on the HDD (HDD/Users/account_name/.) Select the folder, click on Open button. Restart the computer as directed. When the computer boots up it will now be using the Home folder located on the HDD.

 

Another more technical method involving the Terminal and aliases is discussed in depth here: Using OS X with an SSD plus HDD setup - Matt Gemmell. This is my preferred approach because I can select which of the Home's folders I want on the HDD and which I don't want. For example, I like to keep the Documents and Library folders on the SSD because I access their content frequently.

 

Be sure you retain the fully bootable system on your HDD in case you ever need it.

If you are up to the challenge here is how you make your own Fusion Drive. I cannot guarantee this procedure still works. You should find many more searching Google.

1) Launch the Terminal app. It’s located in Applications > Utilities > Terminal. You can also launch it in seconds by pressing Command-Space on the keyboard, then typing in terminal and pressing the Return key.

2) We want to see a list of the drives installed in the Mac. Type in the following command at the terminal prompt:

diskutil list

A sample of what the output of the diskutil command produces can be viewed here:

Last login: Tue Oct  3 18:02:29 on console

My-iMac:~ user_name$ diskutil list

/dev/disk0 (internal):

  #:                      TYPE NAME                    SIZE      IDENTIFIER

  0:      GUID_partition_scheme                        24.0 GB    disk0

  1:                        EFI EFI                    314.6 MB  disk0s1

  2:          Apple_CoreStorage MacintoshHD            23.6 GB    disk0s2

  3:                Apple_Boot Boot OS X              134.2 MB  disk0s3

 

/dev/disk1 (internal, physical):

  #:                      TYPE NAME                    SIZE      IDENTIFIER

  0:      GUID_partition_scheme                        *1.0 TB    disk1

  1:                        EFI EFI                    209.7 MB  disk1s1

  2:          Apple_CoreStorage MacintoshHD            488.7 GB  disk1s2

  3:                Apple_Boot Boot OS X              134.2 MB  disk1s3

  4:          Apple_CoreStorage Sierra                  36.2 GB    disk1s4

  5:                Apple_Boot Recovery HD            650.0 MB  disk1s5

  6:                  Apple_HFS Storage                474.2 GB  disk1s6

 

/dev/disk2 (internal, virtual):

  #:                      TYPE NAME                    SIZE      IDENTIFIER

  0:                  Apple_HFS Macintosh HD          +511.3 GB  disk2

                                Logical Volume on disk1s2, disk0s2

                                B1E07D43-5126-4F67-8279-4781E3880459

                                Unencrypted Fusion Drive

 

/dev/disk3 (internal, virtual):

  #:                      TYPE NAME                    SIZE      IDENTIFIER

  0:                  Apple_HFS Sierra                +35.8 GB    disk3

                                Logical Volume on disk1s4

                                F75AE4AA-2AB8-4CBC-9F44-4E36BD42A270

                                Unencrypted

    The DiskUtil command at work

3) For each drive, there will be a mount point listed in the format:

/dev/disk#

The # is a number assigned to the drive by OS X. Find the mount points for the SSD and HDD that will make up the Fusion Drive, and write them down.

4) Next, let’s type in a command to create the logical volume group using OS X’s Core Storage. This acts like a container for the pooled drives. We’ll need the exact drive mount points we found in the last step – aren’t you glad I had you write them down? The command has the following format:

diskutil coreStorage create LOGICAL_VOL_GROUP_NAME DRIVE_1 DRIVE_2

LOGICAL_VOL_GROUP_NAME is a name that defines your storage group, while DRIVE_1 is the mount point for the SSD and DRIVE_2 is the mount point for the HDD. As an example, let’s assume that we call the group name “FUSION”, that the mount point for the SSD is /dev/disk1 and the mount point for the HDD is /dev/disk2. In that case, we’ll execute the following command in Terminal:

diskutil coreStorage create FUSION /dev/disk1 /dev/disk2

5) We’re almost there. The last command creates the logical volume where data is stored when we’re done. This command requires that we find the LVG UUID – that’s a unique identifier assigned by OS X to all storage groups. That ID is created by the command in step 4 and is displayed at “Core Storage LVG UUID”. Write down the ID.

Our final command has the format:

diskutil coreStorage createVolume lvgUUID type name size

You have the LVG UUID from the last step, and that goes into the lvgUUID spot. “type” refers to the file system that will be used, which should be the OS X native file system Journaled HFS+ . That is abbreviated for terminal as “jhfs+”. For “name” enter a name for the volume. OS X usually calls this “Macintosh HD”. The “size” is the volume size, which can be entered as numbers in GB, TB, or as a percentage. Since we want to use the entire storage pool as our Fusion Drive, we’ll enter 100%. Here’s the final command to enter (be sure to replace the lvgUUID with the one you wrote down):

diskutil coreStorage createVolume 89E965C6-2AF7-4AFA-ABDC-DC49ECA31E32 jhfs+ “Macintosh HD” 100%

6) After the command has executed, you’ll have a Fusion Drive and the volume should be viewable from within Disk Utility from your USB boot drive. Go ahead and install OS X on the Fusion Drive, selecting it as your installation drive.

Disabling a Fusion Drive

If you should ever need to replace a bad drive in your Fusion Drive or want to upgrade either the SSD or HDD drive — or both — you’ll need to disable the Fusion Drive. This simple Terminal command does the job:

diskutil coreStorage delete lvgUUID

To find the lvgUUID, just run the diskutil list command again from Terminal. Replace lvgUUID with the real identifier, and execute the command — it breaks the fused drive. Remember that all data on those combined drives is lost, so back it up first!

Thanks for your reply Kappy.

But the whole point is I don't want the HDD as it's too slow and no use for my needs. Also I don't believe a Evo 850 + HDD would fit into the for anyone who would want to do that?

Is there no solution to having the Samsung replace the HDD and working together with the internal flash (since it's even faster) as one drive?

最後更新：2017-10-05 04:18:24

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