Fusion Drive – Troubleshooting Issues on Mac Mini

core-storagefusion-drivemac-mini

I'm having weird issues with my internal Fusion Drive.

Symptoms:

It gave itself a new cryptical name, and I can't change it back
In most cases I cannot install new software anymore (e.g. I cannot update Flash)
It is sometimes shutting down immediately
Disk Utility says "no errors found" but can't mount it.

See below for some screenshots:

Referring to Point 4 and 1 (says: Volume seems to be ok, see the weird name…)

Referring to Point 2 (says: Installation failed)

Error while mounting Flash Player installer image:

26.11.15 10:03:42,000 kernel[0]: hfs: mounted Adobe Flash Player Installer on device disk3s1
26.11.15 10:03:42,082 mds[55]: (Volume.Normal:2464) volume:0x7fb9ef004600 ********** Bootstrapped Creating a default store:1 SpotLoc:(null) SpotVerLoc:(null) occlude:0 /Volumes/Adobe Flash Player Installer
26.11.15 10:03:53,137 authexec[510]: executing /Volumes/Adobe Flash Player Installer/Install Adobe Flash Player.app/Contents/MacOS/Install Adobe Flash Player
26.11.15 10:04:14,000 kernel[0]: hfs: could not initialize summary table for Flash Player
26.11.15 10:04:14,000 kernel[0]: hfs: mounted Flash Player on device disk4s2
26.11.15 10:04:17,000 kernel[0]: hfs: unmount initiated on Flash Player on device disk4s2

diskutil cs list output from Terminal:

CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group BD4DE488-7C63-4FBA-9FAC-9B92CD56EDE4
=========================================================
Name:         FusionDrive
Status:       Online
Size:         1249060388864 B (1.2 TB)
Free Space:   0 B (0 B)
|
+-< Physical Volume C106FB79-47F5-4967-924F-043C553FC58E
|   ----------------------------------------------------
|   Index:    0
|   Disk:     disk0s2
|   Status:   Online
|   Size:     249715376128 B (249.7 GB)
|
+-< Physical Volume 6492048E-B397-4457-A12B-DA62DD379B35
|   ----------------------------------------------------
|   Index:    1
|   Disk:     disk1s2
|   Status:   Online
|   Size:     999345012736 B (999.3 GB)
|
+-> Logical Volume Family 40A9F389-D3F0-4D75-89A3-36FFAEA6FD57
    ----------------------------------------------------------
    Encryption Status:       Unlocked
    Encryption Type:         None
    Conversion Status:       NoConversion
    Conversion Direction:    -none-
    Has Encrypted Extents:   No
    Fully Secure:            No
    Passphrase Required:     No
    |
    +-> Logical Volume E02059A8-E5D4-4DFF-9D0F-49408380838E
        ---------------------------------------------------
        Disk:                  disk2
        Status:                Online
        Size (Total):          1242500358144 B (1.2 TB)
        Conversion Progress:   -none-
        Revertible:            No
        LV Name:               ´+ßPÜÜÜÜÜPÜ09O8UI9OOOOOOOIOO09O987UUUUZU6T786Z65444RRRR3ERR5EREREREER5R4E43E4ED43ERE3434R43RE3ER4E3R45REW4W45W343E43W424323231QWQ3W3W23432123432323E23E21W23453213E43212R2WEW1221QQ^21
        Content Hint:          Apple_HFS

Output from Terminal for command sudo gpt -r show /dev/disk0

     start       size  index  contents
         0          1         PMBR
         1          1         Pri GPT header
         2         32         Pri GPT table
        34          6         
        40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
    409640  487725344      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
 488134984     262144      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
 488397128          7         
 488397135         32         Sec GPT table
 488397167          1         Sec GPT header

Output from Terminal for command sudo gpt -r show /dev/disk1

     start        size  index  contents
         0           1         PMBR
         1           1         Pri GPT header
         2          32         Pri GPT table
        34           6         
        40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
    409640  1951845728      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
1952255368     1269760      3  GPT part - 426F6F74-0000-11AA-AA11- 00306543ECAC
1953525128           7         
1953525135          32         Sec GPT table
1953525167           1         Sec GPT header

My counteractions so far

Ran the Apple Hardware Test. Result: nothing found.
Ran the First Aid (see screenshot). Result: nothing found.

No backup available!

Any help is much appreciated!

Follow-up:

The problem while trying to start a Backup you see below. This doesnt make sense, as the external drive has 999gb…

Best Answer

Probably your CoreStorage Logical Volume got corrupted!

I recommend to backup your data to an external drive with Time Machine and rebuild the FusionDrive from scratch.

Time Machine backup

To backup your main volume, boot to your main drive
Attach an external drive. The drive (or at least one volume) has to be formatted as an HFS+ Journaled volume. Check this with Disk Utility. If necessary repartition the external drive. All data on the drive will be destroyed after repartitioning/formatting it. The drive (or at least one volume) has to have the size of the volume to back up (or more).
Usually you will be asked if the external drive should serve as a Time Machine backup drive after plugging it in for the first time. If not, open Time Machine in the System Preferences and configure the external drive as Time Machine backup drive.

Hit Select Backup Drive and choose your external drive:

Turn on Time Machine. The backup will be started after a few minutes and will take some time depending on the size.

Rebuild Fusion Drive

Boot to Internet Recovery Mode by pressing altcmdR while starting your Mac.
Booted to Internet Recovery Mode open Utilities → Terminal in the menubar and enter:
diskutil cs list to get the CoreStorage listing.
Copy the Logical Volume UUID, it's the fifth listed.
Now delete the Logical Volume with diskutil cs deleteVolume LVUUID.
In your case that's diskutil cs deleteVolume E02059A8-E5D4-4DFF-9D0F-49408380838E
Copy the Logical Volume Group UUID, it's the first listed in the listing of diskutil cs list.
Then delete the Logical Volume Group with diskutil cs delete LVGUUID.
In your case that's diskutil cs delete BD4DE488-7C63-4FBA-9FAC-9B92CD56EDE4E
Enter exit and quit 'Terminal'
Open 'Disk Utility'. Enter 'Ignore' if you are asked to fix the drives.
Choose your SSD and partition it: 1 Partition Mac OS X Extended (Journaled), hit the Options button and choose GUID Partiton table and hit OK and Apply.
Please check that the size is ~250 GB

Example:
Choose your HDD and partition it: 1 Partition Mac OS X Extended (Journaled), hit the Options button and choose GUID Partiton table and hit OK and Apply.
Please check that the size is ~1 TB

Example:
Quit Disk Utility and open Terminal
Enter diskutil list

Example (your disk identifiers and sizes are different of course: Your volume SSD probably has the Identifier disk0s2 and the size 250 GB and your volume HDD probably has the Identifier disk1s2 and the size 1.0 TB):
Enter diskutil cs create "Name" IdentifierSSD IdentifierHDD
In your case probably diskutil cs create "FusionDrive" disk0s2 disk1s2.

Copy the resulting LVGUUID

Example:
Enter diskutil cs CreateVolume LVGUUID jhfs+ "FusionDrive" 100%.

Example:
Enter diskutil cs list
Check the size of your Logical Volume. It should have the size ~1.250 TB

Example:
Quit Terminal
Open 'Disk Utility' and check your newly created volume for errors
Quit 'Disk Utility'

Restore Time Machine backup

Attach your external Time Machine backup drive or check this answer if you use NAS or another network share.
Open 'Restore from Time Machine Backup'
Choose the appropriate Time Machine backup and restore your system
Reboot to your restored system.
Unmount and detach your Time Machine backup drive
Open 'Terminal' and enter 'diskutil list'
Check if your 'Recovery HD' is listed.
If your 'Recovery HD' is missing, usually reinstalling your current system with the latest available system installer (e.g. 'Install OS X Yosemite (10.10.5)' if Yosemite is currently installed) will recreate it without loosing any data.
After reinstalling the system with the latest available system installer open App Store and install the latest security fixes.

Restore from other sources

If you don't have a Time Machine backup or another appropriate backup, you have to install the system manually.

Booted to Internet Recovery Mode choose "Restore OS X" (or something similar). This will download and install the original OS X coming with your Mac.
After installing OS X configure your Mac with your common user. Download and upgrade to the appropriate system (in your case probably 10.10.5). If you haven't "purchased" (it is or was free) OS X Yosemite with your Apple App Store account you are lost and you have to get it from somewhere else.
After upgrading to OS X Yosemite attach your external drive and open the restore image.
Copy all necessary files & folders in your old user folder to your new account. Avoid overwriting existing folders of your new account! Also check your old /Users/your_user_name/Library folder (which usually is invisible!).
Download and reinstall all needed applications.

Related Solutions

How to see disk usage within a Fusion Drive (CoreStorage Logical Volume)

iostat command check out the complete article from JollyJinx blog.

http://jollyjinx.tumblr.com/post/34638496292/fusion-drive-on-older-macs-yes-since-apple-has

Fusion Drive – Repairing Possible Mess-Up on 1TB iMac with BootCamp

Theoretically everything is fine with your Fusion Drive. Fusion Drives look like this. Disk0 is your SSD with 121 GB and disk1 is your HDD with ~1 TB (~1.121 TB summed up).

The larger parts of your SSD (disk0s2) and your HDD (disk1s2) are pooled to a CoreStorage LVG (Fusion Drive: disk3) with a size of 967.8 GB. The rest is reserved for EFIs, a Recovery HD (alltogether ~1.3 GB) and your old Windows partition - now probably free space (~152 GB).

The logical volume 'Macintosh HD' (967.8 GB) spans disk0s2 and disk1s2. This is the first 'Macintosh HD' in picture 1. The volume 'Macintosh HD' - it's the one visible on the desktop - should ideally also have about 967.8 GB. This is the second 'Macintosh HD' in picture 1.
In fact it has only 852.67 GB (see picture 3).

In the second picture the logical volume 'Macintosh HD' is the first listed in black, the volume 'Macintosh HD' is the second listed in black, the other two 'Macintosh HD's listed in grey are the parts of your SSD and HDD dedicated to the logical volume 'Macintosh HD'.

In my opinion something went wrong after deleting various partitions with the Bootcamp Assistant/Disk Utility or in Windows.

Preparation:

Detach any external drive (especially your external Time Machine backup drive)
Restart to Internet Recovery Mode by pressing alt cmd R at startup.
The prerequisites are the latest firmware update installed, either ethernet or WLAN (WPA/WPA2) and a router with DHCP activated.
On a 50 Mbps-line it takes about 4 min (presenting a small animated globe) to boot into a recovery netboot image which usually is loaded from an apple/akamai server.

I recommend ethernet because it's more reliable. If you are restricted to WIFI and the boot process fails, just restart your Mac until you succeed booting.

Alternatively you may start from a bootable installer thumb drive (preferably Mavericks or Yosemite) or a thumb drive containing a full system (preferably Mavericks or Yosemite).

Now you may either repair CoreStorage or rebuild your Fusion Drive:

'Repair CoreStorage' (not recommended):

First i would try to check the volume 'Macintosh HD' with Disk Utility. If the volume is corrupted consider a reinstall of Mac OS X.
If the volume is ok quit Disk Utility
Open Terminal and enter diskutil unmountDisk /dev/LVIdentifier and both diskutil unmountDisk /dev/DiskContainingApple_CoreStorageIdentifier
In your case: first diskutil unmountDisk /dev/disk3 then diskutil unmountDisk /dev/disk0 and diskutil unmountDisk /dev/disk1
remove the EFI NO NAME partition with gpt remove -i IndexNumberOfEFINoName DiskIdentifier:
gpt remove -i 4 disk1
Remount the CoreStorage disks and then the Logical Volume:
In your case: first diskutil mountDisk /dev/disk0 and diskutil mountDisk /dev/disk1 and then diskutil mount /dev/disk3.

enter gpt -r -vvv show /dev/diskIdentfierOfApple_CoreStorage to get infos of your HDD CoreStorage disk.
In your case: gpt -r -vvv show /dev/disk1
It should look like this:

-bash-3.2# gpt -r -vvv show /dev/disk1
gpt show: /dev/disk1: mediasize=1000204886016; sectorsize=512;         blocks=1953525168
gpt show: /dev/disk1: PMBR at sector 0
gpt show: /dev/disk1: Pri GPT at sector 1
gpt show: /dev/disk1: GPT partition: type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, start=40, size=409600
gpt show: /dev/disk1: GPT partition: type=53746F72-6167-11AA-AA11-00306543ECAC, start=409640, size=1671210848
gpt show: /dev/disk1: GPT partition: type=426F6F74-0000-11AA-AA11-00306543ECAC, start=1671620488, size=1269760
gpt show: /dev/disk1: Sec GPT at sector 1953525167                               
     start          size  index contents                                        
         0             1        PMBR                                            
         1             1        Pri GPT header                                  
         2            32        Pri GPT table                                   
        34             6
        40        409600      1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
    409640    1671210848      2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
1671620488       1269760      3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
1672890248     280634887
1953525135            32        Sec GPT table
1953525167             1        Sec GPT header

The free space on your HDD has 280634887 blocks. Please calculate the biggest block number dividable through 8. That's 280634880 blocks (á 512 bytes) which equals 143685058560 B or ~143.7 GB. Add the size of your HDD CoreStorage Physical Volume (852666400768 B) The result is 143685058560 B + 852666400768 B = 996351459328 B
Resize your HDD CoreStorage physical volume with diskutil cs resizeDisk HDDPVUUID newsize
In your case: diskutil cs resizeDisk 93892BE8-2B7F-4ABD-A4C3-984495DCD98D 996351459328b
Calculate the maximal size of your CoreStorage Logical Volume in diskutil cs list: (size disk0s2) + (size disk1s2) In your case that's 120988852224 B + 996351459328 B = 1117340311552 B. That should be the size of your refreshed Logical Volume Group.
Resize your Logical Volume with diskutil cs resizeVolume LVUUID LVGSize-128 MB In your case that's diskutil cs resizeVolume D237FFDC-7DA4-41D7-AC13-4CC7E5E8C0A0 1117212311552b. If you get an error (There is not enough free space...) choose a smaller size like 1117148311552b.
Quit Terminal and open Disk Utility.
Check your expanded CoreStorage Volume for errors.
Quit Disk Utility, choose your CS volume as startup disk and restart your Mac

'Rebuild Fusion Drive' (recommended if you have a Time Machine backup)

Booted to Internet Recovery Mode open Utilities → Terminal in the menubar and enter:
diskutil cs list to get the CoreStorage listing.
Copy the Logical Volume UUID, it's the fifth listed.
Now delete the Logical Volume with diskutil cs deleteVolume LVUUID.
In your case: diskutil cs deleteVolume D237FFDC-7DA4-41D7-AC13-4CC7E5E8C0A0.
Copy the Logical Volume Group UUID, it's the first listed in the listing of diskutil cs list.
Then delete the Logical Volume Group with diskutil cs delete LVGUUID.
In your case: diskutil cs delete 1EFE58BC-3613-44C4-86EE-D816F3B66E3E
Enter exit and quit 'Terminal'
Open 'Disk Utility'. Enter 'Ignore' if you are asked to fix the drives.
Choose your SSD and partition it: 1 Partition Mac OS X Extended (Journaled), hit the Options button and choose GUID Partiton table and hit OK and Apply.
Please check that the size is ~121 GB

Example:
Choose your HDD and partition it: 1 Partition Mac OS X Extended (Journaled), hit the Options button and choose GUID Partiton table and hit OK and Apply.
Please check that the size is ~1 TB

Example:
Quit Disk Utility and open Terminal
Enter diskutil list

Example (your disk identifiers and sizes are different of course: Your volume SSD probably has the Identifier disk0s2 and the size 121 GB and your volume HDD probably has the Identifier disk1s2 and the size 1.0 TB):
Enter diskutil cs create "Name" IdentifierSSD IdentifierHDD
In your case probably diskutil cs create "Macintosh HD" disk0s2 disk1s2.

Copy the resulting LVGUUID

Example:
Enter diskutil cs CreateVolume LVGUUID jhfs+ "Macintosh HD" 100%.

Example:
Enter diskutil cs list
Check the size of your Logical Volume. It should have the size ~1.121 TB

Example:
Quit Terminal
Open 'Disk Utility' and check your newly created volume for errors
Quit 'Disk Utility'
Attach your external Time Machine backup drive or check this answer if you use NAS or another network share.
Open 'Restore from Time Machine Backup'
Choose the appropriate Time Machine backup and restore your system
Reboot to your restored system.
Unmount and detach your Time Machine backup drive
Open 'Terminal' and enter 'diskutil list'
Check if your 'Recovery HD' is listed.
If your 'Recovery HD' is missing, usually reinstalling your current system with the latest available system installer (e.g. 'Install OS X Mavericks (10.9.5)' if Mavericks is currently installed) will recreate it without loosing any data. AFAIK Recovery Partition Creator 3.8 will NOT create a Recovery HD on CoreStorage volumes.
After reinstalling the system with the latest available system installer open App Store and install the latest security fixes.

Best Answer

Related Solutions

How to see disk usage within a Fusion Drive (CoreStorage Logical Volume)

Fusion Drive – Repairing Possible Mess-Up on 1TB iMac with BootCamp

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