sailor25462 Posted November 3, 2018 Share Posted November 3, 2018 Folks, I‘m afraid I need your support, please. I had successfully finished a clean install of Mojave with fusion drive and after this I retrieved my personal data back from my time machine backup. So far, so good. Today, however, within just some usual work, my machine completly freezed. Something which I had never really had in the past. Pushed reset button, but now - holy f... - my fusion drives appears split as two separate apfs drives. Since I haven‘t made a new time machine backup yet, I can still easily go back to high Sierra, but actually this is a scary incident and I‘m wondering if anyone else did have such a crash before, too? Is there any non-destructive way to get the fusion drive back „fused“ or do I have to re-create it and make a new clean install? (Which would just costs me another 6 hours or so, since my backup is nearly 1 TB in size.... Any advise is highly appreciated! Link to comment https://www.insanelymac.com/forum/topic/336328-apfs-fusion-drive-crashed-split/ Share on other sites More sharing options...
xtraa Posted January 2, 2019 Share Posted January 2, 2019 Not sure if this will help you but you can try to merge it back: https://support.apple.com/en-gb/HT207584 Link to comment https://www.insanelymac.com/forum/topic/336328-apfs-fusion-drive-crashed-split/#findComment-2657070 Share on other sites More sharing options...
sailor25462 Posted January 4, 2019 Author Share Posted January 4, 2019 Thanks xtraa for your feedback and glad to see someone replying who's living quite near to my place, too Indeed, I have come across this and can confirm that it creates a new fusion drive (automatically), but does not merge back in any way that it could preserve any "old" data. The bottom line is: I had to use my time machine backup after I did the resetFusion command with diskutil, it does delete all content on both hdd's. By the way: resetFusion does work only when there are exact 2 drives, i.e. one ssd and one spinning drive, present. So you need to deactivate other hdd's first in BIOS or resetFusion will quit. It also appears that the fusion drive split happened just again yesterday. I'm not so keen on testing this any further for obvious reasons, but I think it breaks when the boot process (last stage before login) hangs for some reason. In this particular case, I had changed my CPU and graphics settings and switched from external GPU to internal HD4000 (for testing). Boot froze at let's say 90% (no -v) and I had to make a cold restart after all. With this, fusion drive was gone (again). Lesson learned To me it seems that the fusion drive is quite vulnerable when it comes to cold restarts during boot process. Better to avoid this during testing conditions and use a single drive installation instead. Link to comment https://www.insanelymac.com/forum/topic/336328-apfs-fusion-drive-crashed-split/#findComment-2657283 Share on other sites More sharing options...
xtraa Posted January 22, 2019 Share Posted January 22, 2019 (edited) Turns out my previous mainboard was the same model than yours. (Z68AP-D3 v.20) I ran across a different problem when I tried fusion drive about 5 years ago. Sometimes I was unable to boot and it turned out to be the OsxAptioFix driver in my drivers64UEFI folder at that time. Because fusion drive was relatively new at that point, I had to set it up manually from the terminal. For reference I dropped you the guide I posted at rampage's blog plus the archive link to the blog entry he made out of it. The easiest solution would be to just find a real Mac, connect the drives via USB and fuse it together with the disk utility. If I remember it correctly, this also worked at some point. If this is not an option, I would first change the AptioFix Driver in Clovers UEFI64 folder to see if another one works. There may be a chance that OSX magically combines your two drives together again. I know this board had boot issues due to UEFI sometimes. There are I think 2 or 3 drivers that already come with the clover installation and probably one or two modified on the net. Since it's a long time gone, I am sorry that I can't simply share my setup files anymore. - Always use only ONE AptioFix Driver at a time, not two or more. So make sure your UEFI folder only contains one. - I strongly recommend to try the different AptioFixes with a Clover booting from a USB stick in order to be able to boot again if a driver shouldn't work. There is a good chance that at least one driver may not work. If you want to look more into it, here is my old guide with the terminal commands for the manual setup of a fusion drive that I posted on Rampage's page. He worked it over and added it to his blog at this time. It's old and from Mavericks but I think it doesn't matter because your problem may be on a deeper level. This is the old comment: https://rampagedev.wordpress.com/os-x-10-8-mountain-lion/fusion-drive/#comment-7164 And more importantly, since the blog is gone, here is a backup from archive.org. be patient, it may take a while to load: https://web.archive.org/web/20150825011033/http://www.rampagedev.com/?page_id=308 Hope that helps. Edited January 22, 2019 by xtraa Link to comment https://www.insanelymac.com/forum/topic/336328-apfs-fusion-drive-crashed-split/#findComment-2660595 Share on other sites More sharing options...
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