FUSION DRIVE NOT VISIBLE

Discussion in 'macOS High Sierra (10.13)' started by macoramma, Mar 19, 2018.

  1. macoramma macrumors newbie

    Joined:
    Mar 7, 2018
    Location:
    Canada
    #1
    Split Fusion drive on i-Mac running High Sierra was restored following Apple’s instructions .when attempting to reinstall the OS the fusion drive does not appear in the screen for destination disks.fusion is similarly not visible in Finder or Disk Utility.Both parts of the fusion drive appear with diskutil list.How do I make the Fusion drive re-appear?any suggestions
     
  2. casperes1996 macrumors 68040

    casperes1996

    Joined:
    Jan 26, 2014
    Location:
    Horsens, Denmark
    #2
    Print the outputs of diskutil list and diskutil cs list
     
  3. macoramma thread starter macrumors newbie

    Joined:
    Mar 7, 2018
    Location:
    Canada
    #3
    2B141862-2053-4FF1-AB05-AAB972691A3F.jpeg 9E898166-9FFE-417C-A623-66C61FAD8F7C.jpeg
     
  4. Shadow Jolteon, Mar 19, 2018
    Last edited: Mar 19, 2018

    Shadow Jolteon macrumors regular

    Shadow Jolteon

    Joined:
    Feb 1, 2018
    Location:
    United States
    #4
    Did you format it after recreating the Fusion Drive from them? If not, you will need to format it as "Mac OS Extended (Journaled)" in Disk Utility before it will show up as a destination.

    To format your Fusion Drive: Once you open Disk Utility, select the drive on the left side, then choose the erase icon from the toolbar, make sure "Mac OS Extended (Journaled)" is selected for the format, give it a name, then click erase. Once the process completes, you should be good to reinstall macOS.

    Edit: Also, if the installer you're using is for macOS High Sierra, you may need to click the view icon in the toolbar, then check "Show All Devices" to see your unformatted drive.
     
  5. casperes1996 macrumors 68040

    casperes1996

    Joined:
    Jan 26, 2014
    Location:
    Horsens, Denmark
    #5

    Next time, could you please either copy/paste or take a screenshot? Kinda hurt reading that...


    Anyways, this does look a bit strange. You have an LVG, and it is spread among your two drives, but it shows no virtual disk in diskutil list.

    I would recommend trying the following things

    1) Use the resizeStack command to try and see if your cs volume is just set to be 0 in size.
    Syntax is as follows
    11111111-2222-3333-4444-555555555555 3211g JHFS+ New 3211g
    With 11111111-2222-3333-4444-555555555555 being replaced by your lvUUI

    2) If that didn't work, try deleting the cs group and remaking it.

    3) Output any error messages here
     
  6. BLUEDOG314 macrumors 6502

    BLUEDOG314

    Joined:
    Dec 12, 2015
    #6
    It's sounding like you will need to do a rebuild. I've had something similar to this happen and no matter what I did, they showed up split.
     

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