Upgrading Mac Mini 2011 2.7 DIY Fusiondrive to Yosemite

Discussion in 'Mac mini' started by borgusio, Oct 19, 2014.

  1. borgusio macrumors regular


    Jul 22, 2011
    Hello Everyone,

    I am a - happy - user of a Mac Mini 2011.
    It is a dual core i7 2.7 GHZ with 16 GB of Ram and 500 GB Hard Disk.
    I added a Samsung SSD 830 two years ago and I am using it as a DIY fusion drive.
    I did not update to Mavericks because I did not see any reasons to take the riske of screwing my fusion drive. I am still waiting for broadwell minis, and given that my Mac is still as fast as the present generation, I will not update to the 2014.

    So far so good. However, I would like now to enjoy Yosemite and Handoff. In theory the bluetooth chip installed in it is capable of doing it - hopefully apple will not block it via software.

    Any tips on how to do the upgrade and preseve my fusion drive?
  2. majkom macrumors 65816

    May 3, 2011
    why upgrade should do anything to your fussion drive? (is that because it is not officially supported on 2011 and older??)
  3. borgusio thread starter macrumors regular


    Jul 22, 2011
    Correct, I am not sure if there will be any nasty surprises in the process.
    I googled a bit - but did not found a topic which applies to this specific Mac, so I thought it may be useful also for others if I open one.

    Usually in the past I always went for a restore:
    1. Download the new OS.
    2. transfer it to USB key
    3. restart from the USB and install new OSX - in this case Yosemite
    4. load my application and data as time machine restore.

    the question though is what will happen to the fusion drive - specially if yosemite will recognise it or I risk to end up with two separate disks?
  4. Benjamin99 macrumors member

    Jan 31, 2012
    The Woodlands, TX
  5. surroundfan macrumors 6502

    Nov 22, 2005
    Melbourne, Australia
    I have a 2011 mini with a DIY fusion drive.

    The steps needed are:
    1. Download Yosemite from MAS
    2. Install Yosemite.

    No screwing around required because you're just upgrading the software on the same Logical Volume Group...
  6. borgusio thread starter macrumors regular


    Jul 22, 2011
    Thanks, what do you mean by "upgrading", will a clean install work, as well?

    Besides, I am also trying to understand how to make Handoff working. There is a Threat about the MBP2011, but it seems not 100% ok for the Minis. I If you have any Input here would be appreciated.
  7. borgusio thread starter macrumors regular


    Jul 22, 2011
    Regarding this issue, actually I use Trim Enabler, therefore I Imagine that it would be enough to switch off the Trim Function via Trim Enabler?
  8. borgusio thread starter macrumors regular


    Jul 22, 2011
    I answer myself:

    Apparently apple is making life more difficult for solution based on modified kept files. This should apply to the Handoff tweak, as well.
  9. borgusio thread starter macrumors regular


    Jul 22, 2011

    Just completed the update of this great machine, everything is working perfect in Yosemite!

    2,7 GHz Intel Core i7
    16 GB 1600 MHz DDR3
    AMD Radeon HD 6630M 256 MB
    DELL 2407WFP
    DIY Fusion Drive Samsung 830 256 GB and Apple 500 GB 5400 RPM

    I post my experience, in case it would be useful for anyone else.

    1) How to install Yosemite with a Recovery partition on Fusion Drive
    - Disable TRIM
    First of all, you should disable TRIM. Just download TRIM enabler and deactivate it:

    Then force a back up from time machine. I did this in order to be 100 % sure that when I will migrate my Time machine back-up into Yosemite, TRIM will not mess up with the installation, since a clean install will require all your drivers to be signed. If you leave trim on and upgrade the system, for instance, you will not able to boot once you have finished to install Yosemite

    - Creating the USB Installer for Yosemite
    After downloading The Yosemite installer, you want to transfer it to a 8GB USB by opening the terminal and typing in the following command:

    sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ Yosemite.app

    Be careful! On internet there are other methods which describe how to do this, however they will not preserve the Restore partition! The Apple document describing this command can be found here:

    - Preparing Fusion Drive for Recovery Partition
    Second, you will restart your Mac, keep pressed the option button on the keyboard and select the USB stick as startup disk. You will land in the Yosemite installer. Now comes the trick:
    You open disk utility, select your fusion drive and do not touch the partitions, or use weird terminal commands as other guides are suggesting!
    Instead, you just erase the present fusion drive, you quit disk Utility and start the installation process.
    At the end it will leave you with "one second remaining" which in fact lasts more then ten minutes, I believe because of the recovery partition set up

    - Recovering your data
    You want just to start Migration assistent and import all your data from Time machine. I suggest also to repair disk permission as the installer of Yosemite is not that clean...

    2) Activate Trim
    Download the most recent version from cindory, install and start trim enabler:
    You must restart the mac two times in order to activate it. The first one will remove the Kext signature required by default by yosemite, the second one to actually start Trim. Some users are worried by touching this setting in Yosemite, but I believe that if you don't download daily unknown apps from the internet, the risk is acceptably low.

    3) Activate continuity and Handoff by downoading and running continuity activation tool, created by Dokterdok a MacRumors forum user:

    Restart and enjoy your Mini!
    I am not sure if this is because of the fast DDR5 VRAM integrated 6630 Graphics, or the 16 GB of Ram, but Yosemite on my mini seems snappier here than on the mac book pro 2013 of my girlfriend with 8 GB Ram...
  10. Val-kyrie macrumors 68000

    Feb 13, 2005
    Is Trim Enabler really necessary with a Fusion Drive setup?
  11. borgusio thread starter macrumors regular


    Jul 22, 2011
    Actually the activation of TRIM will just impact the SSD performances. Since Samsung recommends it, I was used to have it active in Mavericks and had great performances since then.

    The fusion configuration will of course benefit from it, since it tries to fill the SSD as much as possible and this is exactely the situation where a disk without SSD will loose in performance

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