I created a fusion drive on my MacBook Pro running Mountain Lion and it worked like a charm for a while, but it somehow got corrupted.
Now I am unable to reformat or repartition the whole thing.
> diskutil cs list
CoreStorage logical volume groups (1 found) | +-- Logical Volume Group 40B334F6-6988-4727-9A2B-48E7999F4047 ========================================================= Name: MacintoshHD Size: 558926610432 B (558.9 GB) Free Space: 135995392 B (136.0 MB) | +-< Physical Volume AC91E9F8-CAAA-48B9-A000-93E559F5D2DD | ---------------------------------------------------- | Index: 0 | Disk: disk0s2 | Status: Online | Size: 59162722304 B (59.2 GB) | +-< Physical Volume 1319D374-879E-418F-88EF-5AA163B4105C | ---------------------------------------------------- | Index: 1 | Disk: disk1s2 | Status: Online | Size: 499763888128 B (499.8 GB) | +-> Logical Volume Family 3E85E6B1-4E99-4CBD-A34E-E720A090F373 ---------------------------------------------------------- Encryption Status: Unlocked Encryption Type: None Conversion Status: NoConversion Conversion Direction: -none- Has Encrypted Extents: No Fully Secure: No Passphrase Required: No | +-> Logical Volume 76A3020B-B3C2-4905-9E09-2EBB5470261C --------------------------------------------------- Disk: disk2 Status: Online Size (Total): 556000083968 B (556.0 GB) Size (Converted): -none- Revertible: No LV Name: HD Volume Name: HD Content Hint: Apple_HFS
> diskutil cs delete 40B334F6-6988-4727-9A2B-48E7999F4047
Started CoreStorage operation Ejecting Logical Volumes [ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ]
I remain stuck there and cannot delete the Logical Volume Group, or do anything at all on it's components.
By now I would be satisfied if I could just wipe /dev/disk0 and /dev/disk1 completely and start over, but unfortunately this does not work either :
> diskutil zeroDisk /dev/disk0
Started erase on disk0 Error: -69879: Couldn't open disk Underlying error: 16: POSIX reports: Resource busy
I hope someone will be able to help me, I have absolutely no idea how to recover this computer!
I also posted this question on Apple's forums, but I expect a better answer answer and more importantly a longer shelf life!