Hi,
I have problems with Fusion Drive. I installed the beta version of MacOS High Sierra and I returned back to macOS Sierra 10.12.5, but the Fusion drive is divided into two sections. What should I do?
Internet recovery did not help?
I have iMac 27 "Retina 5k late 2014 and 1Tb Fusion drive
Hi, I had the same problem.
To fix it I had to create the Fusion drive as follows:
http://www.macworld.com/article/2014011/storage-drives/how-to-make-your-own-fusion-drive.html
Good luck! 🙂
You need to boot your mac with USB installation thumb drive. After that;
Open Terminal
type
diskutil listand press enter.
It will list your disks like this:
/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 LogicVolGroup 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 LogicVolGroup 999.3 GB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
drive1 is /dev/disk0 and drive2 is /dev/disk1 (as sample)
Type following command and press enter dont forget to change disk name (/dev/disk0 etc)
diskutil coreStorage create LogicalGroup /dev/disk0 /dev/disk1When the process is done, your logical volume group should be completed You can find a unique identifier for the group, which you should copy to your clipboard. its starting wth UDID like this : 50B457C3-ADC6-4EDC-9ABA-FD8C6EEDE69A (change with your UDID)
Final command is:
diskutil coreStorage createVolume 50B457C3-ADC6-4EDC-9ABA-FD8C6EEDE69A jhfs+ "Macintosh HD" 100%After that, you can fresh install macOS to newly created logical drive from USB or internet recovery. And restore from TimeMachine Backup.
Cheers
I recovered mine like this:
( ALL DATA WILL BE LOST! )
Start up in internet recovery mode with command-shift-R. Start the Terminal app from the utilities menu and paste in this line at the prompt:
( The following is all one line. Select all of it ! )
N=Macintosh\ HD; for d in /dev/disk?; do o=`diskutil info $d`; [[ ! "$SSD" ]] && grep -lqw 'APPLE SSD' <<< "$o" && SSD=$d; [[ ! "$HDD" ]] && grep -lqw 'APPLE HDD' <<< "$o" && HDD=$d; [[ "$SSD" && "$HDD" ]] && break; done; diskutil cs create "$N" $SSD $HDD && diskutil cs createLV "$N" jhfs+ "$N" 100%
Incidentally, I got this info from here:
https://discussions.apple.com/thread/7453778?start=0&tstart=0
Same problem with my 2tb 4k imac. Had to split my Fusion drive and then join them with above comands just to restore Sierra.