Re: High Sierra Installation on Existing RAID 0 Array

Hi reel! Can you give more details about how you created the APFS RAID0 volume? Thanks!

This is the longest I have ever seen a macOS bug report sit idle without any response at all.

I have the same issue. Mac Mini with two internal 500MB HDDs in Raid 0. Can't upgrade to High Sierra

Doesn't seem like that.

I think it has something to do with APFs and the software controlled RAID.

Maybe there has to be a special APFs-RAID if it's software controlled, so the copy charasteristics can be handled.

This may cause a new RAID management system, that is not compatible with previous software RAIDS

I found this on Apple's Website

https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/APFS_Guide/FAQ/FAQ.html

"Can I boot macOS High Sierra from an APFS-formatted hard disk?

Yes. macOS High Sierra supports Apple File System for both bootable and data volumes."

"Can RAID be used with Apple File System?

Yes. Apple File System does not directly implement software RAID; however APFS-formatted volumes can be combined with an Apple RAID volume to support Striping (RAID 0), Mirroring (RAID 1), and Concatenation (JBOD). APFS-formatted volumes can also be used with direct-attached hardware RAID solutions."

If you created the RAID 0 using Disk Utility GUI in latest beta, then I think you don't have APFS as a choice.
But you can have an APFS Raid 0 volume using Terminal:

diskutil appleRAID create stripe "HighSierra" apfs disk3 disk4

Don't forget to replace [disk3] and [disk4] with your correct disk id´s

This way you will end up with an APFS RAID 0 (stripe)  and then you do the same you did with Disk Utility to restore your previous HS instalation and if that doesn't work with APFS for some reason, then do it like I did with Carbon Copy Cloner V5

Any luck?

Oh, this is terrible news. I'm currently running Sierra from a SSD RAID0 I setup during a clean install using Disk Utility, and then installing Sierra.

What does this mean now? I won't be able to simply upgrade to HS?

https://bugreport.apple.com/

I saw in the APFS Guide FAQ that APFS supports RAID configurations: https://developer.apple.com/library/content/releasenotes/General/RN-macOSSDK-10.13/index.html

There is no mention that AppleRAID support was dropped from the macOS High Sierra Release Notes: https://developer.apple.com/library/content/releasenotes/General/RN-macOSSDK-10.13/index.html

I filed a bug: 34756034

Just for anyone else searching, it appears that a clean install of High Sierra with newly made APFS RAID 0 will not work either.

I have a 2012 Mac Mini with 2 Samsung 850 PROs that ran Raid 0 on El Capitan. I'm morbid + I have the luxury of all my data being backed up elsewhere so I wiped the raid array, installed High Sierra via bootable USB on an external SSD, booted from there and then created a new APFS raid with the two Samsungs. Previously, the High Sierra installer would not even let me select the El Capitan created Raid partition at all. However, once I made it a APFS raid, it allowed me to select the drive. Install went 100% until the very end where I get the error message "Could not create a pre-boot volume for APFS install".

I'm trying internet install for ***** and giggles but I'm fairly sure I will get the same result. I hope this saves someone a few hours

I second this remark!

I just tried to install Mojave 10.14 on a dual drive Mini server. It accepts the raid 0, allows me to restore a time machine backup to the drive but gives the "?" when it tries to boot from the drive. I plan to experiment a bit, but it appears 10.14 goes through the whole installation without telling me that I'm doing something wrong, so maybe it will work.