Help with undoing Fusion Drive

Discussion in 'OS X El Capitan (10.11)' started by Iphoneness, Feb 24, 2016.

  1. Iphoneness macrumors 6502

    Iphoneness

    Joined:
    Mar 19, 2010
    Location:
    Raleigh, North Carolina
    #1
    image.jpg image.jpg
    So I have the SSD and second hard drive in my 2011 MacBook Pro. I thought it would be cool to try the DIY Fusion drive so I gave it a shot. I got all the way to the user login screen and the computer "restarted because of a problem." After doing some searching, I found that the 2011 has issues with the Fusion so I'm trying to go back and just deal with having the two separate drives. However, when I try to run the delete disk command, it tells me that the identifier doesn't seem to exist. What should I do? I have my data on a time machine backup so that's not an issue.
     
  2. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #2
    Run this command and tell me the output then I think I can tell you how to kill it. There is something off looking about your volume layout and I suspect that is why your Fusion is not working for you.

    Code:
    diskutil cs list
     
  3. Iphoneness thread starter macrumors 6502

    Iphoneness

    Joined:
    Mar 19, 2010
    Location:
    Raleigh, North Carolina
    #3
    Here you go good sir. The 119.7gb is the ssd boot drive and the 749.8 is the secondary internal drive.
    --- Post Merged, Feb 25, 2016 ---
    So I just tried the CS delete function again, but used that very first logical volume identifier and it managed to undo the fusion, resulting in just the two drives now. Here is the new diskutil list. Are these set up incorrectly for the fusion setup to work?
     

    Attached Files:

  4. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #4
    That should mean that you have to erase both drives.
    Hope you have a backup.
     
  5. Iphoneness thread starter macrumors 6502

    Iphoneness

    Joined:
    Mar 19, 2010
    Location:
    Raleigh, North Carolina
    #5
    I do have a time machine backup
     
  6. BLUEDOG314 macrumors regular

    BLUEDOG314

    Joined:
    Dec 12, 2015
    #6
    Do this:

    diskutil cs delete (UUID for Logical Volume Group, aka the top one)
    Goal here is to make sure when you type diskutil cs list is says no core storage found. Like mentioned above this will erase all info on both drives.

    diskutil cs create "Fustion Drive" disk0 disk1
    This creates a new Logical Volume Group.

    diskutil cs list
    Now copy the UUID for the Logical Volume Group

    diskutil cs createvolume (UUID copied above) jhfs+ "Macintosh HD" 100%
    This creates one jhfs+ partition on the Logical Volume Group named Macintosh HD, which you can obviously change the name of, and the 100% means use all of the Logical Volume Group.
     
  7. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #7
    I'm a little confused by your screenshots. It looks like the first one with the cs list output is from before you stumbled onto the command to kill the Fusion, but now you done so, and the second screenshot is the result... yes?

    So from your first screenshot, this command would have killed the Fusion.

    Code:
    diskutil cs delete "myLogicalVolGroup"
    Then that leaves you the two, "Untitled" stand alone drives. So you can now either individually format each drive then install El Capitan to the SSD like you mentioned, or you can follow BLUEDOG314's instructions to recreate the Fusion drive.
     

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