problem creating fusion drive

Discussion in 'Mac mini' started by Errz, May 15, 2013.

  1. Errz macrumors member

    Joined:
    Mar 9, 2008
    #1
    when i try to key in disktuil cs create Fusion /dev/disk0 /dev/disk1
    i get this error
    Started CoreStorage operation
    Unmounting disk0
    Error: -69888: Couldn't unmount disk

    below is the info of diskutil list. SSD not appearing in Disk Utility . i can only see the 1TB drive.

    /dev/disk0
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *256.1 GB disk0
    1: EFI 209.7 MB disk0s1
    2: Apple_CoreStorage 255.7 GB disk0s2
    3: Apple_Boot Boot OS X 134.2 MB disk0s3
    /dev/disk1
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *1.0 TB disk1
    1: EFI 209.7 MB disk1s1
    2: Apple_CoreStorage 999.9 GB disk1s2
    3: Apple_Boot Boot OS X 134.2 MB disk1s3
    /dev/disk2
    #: TYPE NAME SIZE IDENTIFIER
    0: Apple_HFS Macintosh HD *1.2 TB disk2
    /dev/disk3
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *500.1 GB disk3
    1: EFI 209.7 MB disk3s1
    2: Apple_HFS Clone 499.1 GB disk3s2
    3: Apple_Boot Recovery HD 784.2 MB disk3s3

    anyone know what's wrong?
     
  2. philipma1957 macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    Location:
    Howell, New Jersey
    #2
    THE 256GB DISK IS THERE


    as is the 999gb disk.



    why are you keying in anything at all. are you trying to do this via console / terminal commands


    or with disk utility . quite frankly the terminal method can fail with just 1 miss stroke of the key board
     
  3. gtstricky macrumors regular

    gtstricky

    Joined:
    Apr 19, 2012
    #3
    I had an issue doing it when booted from one of the drives. I ended up creating a bootable flash drive with disk utility on it and it went smooth as butter.
     
  4. Errz thread starter macrumors member

    Joined:
    Mar 9, 2008
    #4
    manage to set up the fusion drive.

    thanks all!
     

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