Revert Core Storage?

Discussion in 'macOS' started by CoastalOR, Mar 10, 2017.

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  1. CoastalOR macrumors 68000

    CoastalOR

    Joined:
    Jan 19, 2015
    Location:
    Oregon, USA
    #1
    System: 2015 MBP, macOS 10.12.3, Filevault 2 disabled

    I am trying to decide if I should revert core storage. I do not understand why Apple has core storage enabled on all newer Macs.
    Is there any reason not to revert the core storage?
    If I revert core storage, what happens if I want to enable Filevault later?

    Here is information I have found during internet research:
    Core Storage is a logical volume management system on macOS originally important for creating fusion drives (available since 10.7).

    Core Storage should not be disabled if:
    File Vault 2 is enabled.
    Using a Fusion drive.

    How to disable (revert) core storage. Did I miss anything?:
    Run these 2 commands in terminal.
    diskutil cs list
    diskutil coreStorage revert lvUUID
    where lvUUID is the last lvUUID reported by the previous Terminal command.
     
  2. chrfr macrumors 604

    Joined:
    Jul 11, 2009
    #2
    There's no reason to disable CoreStorage. Is there a problem you think you're having?
     
  3. CoastalOR thread starter macrumors 68000

    CoastalOR

    Joined:
    Jan 19, 2015
    Location:
    Oregon, USA
    #3
    Thanks for the reply.

    There is no problem, unless I want to partition or adjust partitions. I've been thinking about possibly doing a dual boot Mac OS system with my internal drive. There is no great need to change things other than I'm curious and I'm wondering about the implications. I just don't understand why Apple thinks we need core storage.

    The main question is whether there is a reason to keep the core storage on the MBP?
     
  4. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #4
    No.... you can revert it if you like with the command "diskutil cs revert /" (without the quotes).
     
  5. CoastalOR thread starter macrumors 68000

    CoastalOR

    Joined:
    Jan 19, 2015
    Location:
    Oregon, USA
    #5
    Thanks Weaselboy.
    If I decide to enable FileVault in the future (no current plans), will it initiate core storage again or would I need to restore core storage? If I need to initiate core storage, how?
     
  6. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #6
    Nah.... you won't need to do anything. Just enable FV and it will convert straight to the FV core storage setup. You don't need to reenable core storage first.
     
  7. Fishrrman macrumors G5

    Fishrrman

    Joined:
    Feb 20, 2009
    #7
    Weaselboy wrote:
    No.... you can revert it if you like with the command "diskutil cs revert /"

    Just to clarify:
    Will executing that command result in a drive that is wiped clean of existing data?
    In other words, must one be backed up first before using it?
     
  8. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #8
    No.... it will just turn off core storage and will not erase the drive.
     

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