Skip to content

Instantly share code, notes, and snippets.

@searls

searls/fixing-my-lvu.md Secret

Last active April 2, 2024 20:17
Show Gist options
  • Star 1 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save searls/8348fe8479a9c55e294c9139255e785c to your computer and use it in GitHub Desktop.
Save searls/8348fe8479a9c55e294c9139255e785c to your computer and use it in GitHub Desktop.
Download ZIP
Raw
fixing-my-lvu.md

Initial state

My iMac's fusion drive is "on backwards" with the HDD in front of the SSD and performance generally crappy as a result. Going to try to erase the logical volume group and start again. It is currently mounted via a Mac Mini over Thunderbolt.

current disk listing

$ diskutil list

Output:

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            121.0 GB   disk0s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3

/dev/disk1 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:          Apple_CoreStorage Macintosh HD            999.3 GB   disk1s2
   3:                 Apple_Boot Recovery HD             650.1 MB   disk1s3

/dev/disk2 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            Macintosh HD           +1.1 TB     disk2
                                 Logical Volume on disk0s2, disk1s2
                                 D45EB332-982D-491A-BB0C-8222E474946F
                                 Unencrypted Fusion Drive

/dev/disk3 (external):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         121.3 GB   disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2:          Apple_CoreStorage Fusion Drive            121.0 GB   disk3s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk3s3

/dev/disk4 (external):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         3.0 TB     disk4
   1:                        EFI EFI                     209.7 MB   disk4s1
   2:          Apple_CoreStorage Fusion Drive            3.0 TB     disk4s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk4s3

Offline
                                 Logical Volume Macintosh HD on disk4s2, disk3s2
                                 C846CA63-F92F-46ED-9518-711470F508A0
                                 Locked Encrypted Fusion Drive

$ diskutil cs list

Output:

CoreStorage logical volume groups (2 found)
|
+-- Logical Volume Group 5933B4CA-8C64-4731-8AAB-10B02B468773
|   =========================================================
|   Name:         Macintosh HD
|   Status:       Online
|   Size:         1120333864960 B (1.1 TB)
|   Free Space:   0 B (0 B)
|   |
|   +-< Physical Volume 577DC052-80FB-4FCE-8B3E-4474AC7DBAEE
|   |   ----------------------------------------------------
|   |   Index:    0
|   |   Disk:     disk0s2
|   |   Status:   Online
|   |   Size:     120988852224 B (121.0 GB)
|   |
|   +-< Physical Volume D70AE4A9-F6EF-4130-8FC5-7602140F63AD
|   |   ----------------------------------------------------
|   |   Index:    1
|   |   Disk:     disk1s2
|   |   Status:   Online
|   |   Size:     999345012736 B (999.3 GB)
|   |
|   +-> Logical Volume Family F4430162-9BB6-47A1-ADE2-70078D1E7F5C
|       ----------------------------------------------------------
|       Encryption Type:         None
|       |
|       +-> Logical Volume D45EB332-982D-491A-BB0C-8222E474946F
|           ---------------------------------------------------
|           Disk:                  disk2
|           Status:                Online
|           Size (Total):          1111826497536 B (1.1 TB)
|           Revertible:            No
|           LV Name:               Macintosh HD
|           Volume Name:           Macintosh HD
|           Content Hint:          Apple_HFS
|           LVG Type:              Fusion, Sparse
|
+-- Logical Volume Group 7D6FB49F-B003-4C91-8E1A-BBA00E095FE7
    =========================================================
    Name:         Fusion Drive
    Status:       Online
    Size:         3120722075648 B (3.1 TB)
    Free Space:   114688 B (114.7 KB)
    |
    +-< Physical Volume D6C4EF50-47C3-4AE3-B48C-EBF5936C5148
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk4s2
    |   Status:   Online
    |   Size:     2999733223424 B (3.0 TB)
    |
    +-< Physical Volume C1FFC275-F42E-42AB-BB6F-D8754CBABE67
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk3s2
    |   Status:   Online
    |   Size:     120988852224 B (121.0 GB)
    |
    +-> Logical Volume Family 9BA4CA06-3730-47C1-9A95-1A39B340C1DF
        ----------------------------------------------------------
        Encryption Type:         AES-XTS
        Encryption Status:       Locked
        Conversion Status:       Complete
        High Level Queries:      Fully Secure
        |                        Passphrase Required
        |                        Accepts New Users
        |                        Has Visible Users
        |                        Has Volume Key
        |
        +-> Logical Volume C846CA63-F92F-46ED-9518-711470F508A0
            ---------------------------------------------------
            Disk:                  -none-
            Status:                Locked
            Size (Total):          3114866704384 B (3.1 TB)
            Revertible:            No
            LV Name:               Macintosh HD
            Content Hint:          Apple_HFS
            LVG Type:              Fusion, Sparse

Next, I mounted the disk and re-ran:

$ diskutil list

Output:

# ……………

/dev/disk3 (external):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         121.3 GB   disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2:          Apple_CoreStorage Fusion Drive            121.0 GB   disk3s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk3s3

/dev/disk4 (external):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         3.0 TB     disk4
   1:                        EFI EFI                     209.7 MB   disk4s1
   2:          Apple_CoreStorage Fusion Drive            3.0 TB     disk4s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk4s3

/dev/disk5 (external, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            Macintosh HD           +3.1 TB     disk5
                                 Logical Volume on disk4s2, disk3s2
                                 C846CA63-F92F-46ED-9518-711470F508A0
                                 Unlocked Encrypted Fusion Drive

$ diskutil cs list

Output:

CoreStorage logical volume groups (2 found)
|
+-- Logical Volume Group 5933B4CA-8C64-4731-8AAB-10B02B468773
|   =========================================================
|   Name:         Macintosh HD
|   Status:       Online
|   Size:         1120333864960 B (1.1 TB)
|   Free Space:   0 B (0 B)
|   |
|   +-< Physical Volume 577DC052-80FB-4FCE-8B3E-4474AC7DBAEE
|   |   ----------------------------------------------------
|   |   Index:    0
|   |   Disk:     disk0s2
|   |   Status:   Online
|   |   Size:     120988852224 B (121.0 GB)
|   |
|   +-< Physical Volume D70AE4A9-F6EF-4130-8FC5-7602140F63AD
|   |   ----------------------------------------------------
|   |   Index:    1
|   |   Disk:     disk1s2
|   |   Status:   Online
|   |   Size:     999345012736 B (999.3 GB)
|   |
|   +-> Logical Volume Family F4430162-9BB6-47A1-ADE2-70078D1E7F5C
|       ----------------------------------------------------------
|       Encryption Type:         None
|       |
|       +-> Logical Volume D45EB332-982D-491A-BB0C-8222E474946F
|           ---------------------------------------------------
|           Disk:                  disk2
|           Status:                Online
|           Size (Total):          1111826497536 B (1.1 TB)
|           Revertible:            No
|           LV Name:               Macintosh HD
|           Volume Name:           Macintosh HD
|           Content Hint:          Apple_HFS
|           LVG Type:              Fusion, Sparse
|
+-- Logical Volume Group 7D6FB49F-B003-4C91-8E1A-BBA00E095FE7
    =========================================================
    Name:         Fusion Drive
    Status:       Online
    Size:         3120722075648 B (3.1 TB)
    Free Space:   114688 B (114.7 KB)
    |
    +-< Physical Volume D6C4EF50-47C3-4AE3-B48C-EBF5936C5148
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk4s2
    |   Status:   Online
    |   Size:     2999733223424 B (3.0 TB)
    |
    +-< Physical Volume C1FFC275-F42E-42AB-BB6F-D8754CBABE67
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk3s2
    |   Status:   Online
    |   Size:     120988852224 B (121.0 GB)
    |
    +-> Logical Volume Family 9BA4CA06-3730-47C1-9A95-1A39B340C1DF
        ----------------------------------------------------------
        Encryption Type:         AES-XTS
        Encryption Status:       Unlocked
        Conversion Status:       Complete
        High Level Queries:      Fully Secure
        |                        Passphrase Required
        |                        Accepts New Users
        |                        Has Visible Users
        |                        Has Volume Key
        |
        +-> Logical Volume C846CA63-F92F-46ED-9518-711470F508A0
            ---------------------------------------------------
            Disk:                  disk5
            Status:                Online
            Size (Total):          3114866704384 B (3.1 TB)
            Revertible:            No
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS
            LVG Type:              Fusion, Sparse

recreating the logical volume group

OK, so as for physical our SSD is disk3 and our HDD is disk4.

First, I attempted to create a new CoreStorage logical volume group:

$ diskutil cs create "imac-fusion" disk3 disk4

Output:

Started CoreStorage operation
Unmounting disk3
Repartitioning disk3
Unmounting disk
Creating the partition map
Rediscovering disk3
Adding disk3s2 to Logical Volume Group
Unmounting disk4
Repartitioning disk4
Unmounting disk
Creating the partition map
Rediscovering disk4
Adding disk4s2 to Logical Volume Group
Creating Core Storage Logical Volume Group
Switching disk3s2 to Core Storage
Switching disk4s2 to Core Storage
Waiting for Logical Volume Group to appear
Discovered new Logical Volume Group "DD1F3A9F-7171-4FDF-9994-9453A4C95109"
Core Storage LVG UUID: DD1F3A9F-7171-4FDF-9994-9453A4C95109
Finished CoreStorage operation

To verify this worked, I re-ran:

$ diskutil cs list

Output:

CoreStorage logical volume groups (2 found)
|
+-- Logical Volume Group 5933B4CA-8C64-4731-8AAB-10B02B468773
|   =========================================================
|   Name:         Macintosh HD
|   Status:       Online
|   Size:         1120333864960 B (1.1 TB)
|   Free Space:   0 B (0 B)
|   |
|   +-< Physical Volume 577DC052-80FB-4FCE-8B3E-4474AC7DBAEE
|   |   ----------------------------------------------------
|   |   Index:    0
|   |   Disk:     disk0s2
|   |   Status:   Online
|   |   Size:     120988852224 B (121.0 GB)
|   |
|   +-< Physical Volume D70AE4A9-F6EF-4130-8FC5-7602140F63AD
|   |   ----------------------------------------------------
|   |   Index:    1
|   |   Disk:     disk1s2
|   |   Status:   Online
|   |   Size:     999345012736 B (999.3 GB)
|   |
|   +-> Logical Volume Family F4430162-9BB6-47A1-ADE2-70078D1E7F5C
|       ----------------------------------------------------------
|       Encryption Type:         None
|       |
|       +-> Logical Volume D45EB332-982D-491A-BB0C-8222E474946F
|           ---------------------------------------------------
|           Disk:                  disk2
|           Status:                Online
|           Size (Total):          1111826497536 B (1.1 TB)
|           Revertible:            No
|           LV Name:               Macintosh HD
|           Volume Name:           Macintosh HD
|           Content Hint:          Apple_HFS
|           LVG Type:              Fusion, Sparse
|
+-- Logical Volume Group DD1F3A9F-7171-4FDF-9994-9453A4C95109
    =========================================================
    Name:         imac-fusion
    Status:       Online
    Size:         3121237860352 B (3.1 TB)
    Free Space:   3115382603776 B (3.1 TB)
    |
    +-< Physical Volume 9712CCA1-E539-4166-8E3E-B00A381B58D0
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk3s2
    |   Status:   Online
    |   Size:     120988852224 B (121.0 GB)
    |
    +-< Physical Volume A8904A6D-9245-4209-A69D-1213ED6333FF
        ----------------------------------------------------
        Index:    1
        Disk:     disk4s2
        Status:   Online
        Size:     3000249008128 B (3.0 TB)

And noted the Logical Volume Group ID as DD1F3A9F-7171-4FDF-9994-9453A4C95109

create the volume

Next, I created the CoreStorage volume with:

$ diskutil cs createVolume "DD1F3A9F-7171-4FDF-9994-9453A4C95109" jhfs+ "Macintosh HD" 100%

Output:

Started CoreStorage operation
Waiting for Logical Volume to appear
Formatting file system for Logical Volume
Initialized /dev/rdisk5 as a 3 TB case-insensitive HFS Plus volume with a 245760k journal
Mounting disk
Core Storage LV UUID: 62DFE9B2-1F0F-4624-B180-BAF8D2E247CA
Core Storage disk: disk5
Finished CoreStorage operation

To inspect things worked, I ran:

$ diskutil cs list

Output:

CoreStorage logical volume groups (2 found)
|
+-- Logical Volume Group 5933B4CA-8C64-4731-8AAB-10B02B468773
|   =========================================================
|   Name:         Macintosh HD
|   Status:       Online
|   Size:         1120333864960 B (1.1 TB)
|   Free Space:   0 B (0 B)
|   |
|   +-< Physical Volume 577DC052-80FB-4FCE-8B3E-4474AC7DBAEE
|   |   ----------------------------------------------------
|   |   Index:    0
|   |   Disk:     disk0s2
|   |   Status:   Online
|   |   Size:     120988852224 B (121.0 GB)
|   |
|   +-< Physical Volume D70AE4A9-F6EF-4130-8FC5-7602140F63AD
|   |   ----------------------------------------------------
|   |   Index:    1
|   |   Disk:     disk1s2
|   |   Status:   Online
|   |   Size:     999345012736 B (999.3 GB)
|   |
|   +-> Logical Volume Family F4430162-9BB6-47A1-ADE2-70078D1E7F5C
|       ----------------------------------------------------------
|       Encryption Type:         None
|       |
|       +-> Logical Volume D45EB332-982D-491A-BB0C-8222E474946F
|           ---------------------------------------------------
|           Disk:                  disk2
|           Status:                Online
|           Size (Total):          1111826497536 B (1.1 TB)
|           Revertible:            No
|           LV Name:               Macintosh HD
|           Volume Name:           Macintosh HD
|           Content Hint:          Apple_HFS
|           LVG Type:              Fusion, Sparse
|
+-- Logical Volume Group DD1F3A9F-7171-4FDF-9994-9453A4C95109
    =========================================================
    Name:         imac-fusion
    Status:       Online
    Size:         3121237860352 B (3.1 TB)
    Free Space:   0 B (0 B)
    |
    +-< Physical Volume 9712CCA1-E539-4166-8E3E-B00A381B58D0
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk3s2
    |   Status:   Online
    |   Size:     120988852224 B (121.0 GB)
    |
    +-< Physical Volume A8904A6D-9245-4209-A69D-1213ED6333FF
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk4s2
    |   Status:   Online
    |   Size:     3000249008128 B (3.0 TB)
    |
    +-> Logical Volume Family 748CF44B-A445-42C1-96CF-488AC17BC0EF
        ----------------------------------------------------------
        Encryption Type:         None
        |
        +-> Logical Volume 62DFE9B2-1F0F-4624-B180-BAF8D2E247CA
            ---------------------------------------------------
            Disk:                  disk5
            Status:                Online
            Size (Total):          3115382603776 B (3.1 TB)
            Revertible:            No
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS
            LVG Type:              Fusion, Sparse

Magical! The volumes are finally in the correct order! I must have fat-fingered the creation of the Logical Volume Group the first time I did this.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment