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[Sticky] Mojave does not support booting from RAID volumes

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(@softraid-support)
Member Admin

With the release of 10.14 Mojave, users can no longer startup from RAID volumes. This includes any SoftRAID volume and Apple RAID volumes.

There is no workaround for this, and we do not expect there to be a solution going forward.

We had several discussions with Apple to see if they would re-enable booting in the future, but the chances are slim to zero.

Prepare to migrate your startup volumes to Apple standard volumes before attempting to install Mojave.

Quote
Topic starter Posted : 10/09/2018 11:00 am
 Nubo
(@nubo)
Eminent Member Customer

Note: the new OS is "Mojave".

(Thanks - we fixed that typo - ed.)

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Posted : 10/09/2018 12:55 pm
 heke
(@heke)
New Member Customer

Currently I have this setup:
- iMac 21, 2015, 1TB fusion drive (28GBSSD/5400 HDD)
- Thunderbay mini, 4*250 GB SSD, thunderbolt 2, with softraid lite 5.7, (4*SSD in RAID 0)
I use the Thunderbay as a startupdisk/main drive and the fusion drive as a backup disk (carbon copy).

Because Mojave doesn’t support booting from RAID volumes:

- Should I stay with the setup as it is, and consequently stay with High Sierra?

Or maybe:

- Use one SSD in the Thunderbay as a startup disk, the three others in RAID 0 as home/data drive, the internal fusion drive as backup and upgrade to Mojave? I read some negative posts on speed of external SSD’s in APFS?

or?
thanks!

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Posted : 12/09/2018 2:07 am
(@softraid-support)
Member Admin

- Use one SSD in the Thunderbay as a startup disk, the three others in RAID 0 as home/data drive, the internal fusion drive as backup and upgrade to Mojave? I read some negative posts on speed of external SSD’s in APFS?

or?
thanks!

This is probably your best option. Older computer with Fusion drives is not something I would trust for reliability, too much can go wrong.

Or replace the SSD/HDD in your iMac with a newer, higher capacity, high speed SSD. Use that for booting. then the HDD can be backup, as well as the external Stripe volume. (and subscribe to a backup system like BackBlaze.)

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Topic starter Posted : 12/09/2018 2:22 am
(@nightwatch)
Active Member Customer

With the release of 10.14 Mojave, users can no longer startup from RAID volumes. This includes any SoftRAID volume and Apple RAID volumes.

There is no workaround for this, and we do not expect there to be a solution going forward.

We had several discussions with Apple to see if they would re-enable booting in the future, but the chances are slim to zero.

Prepare to migrate your startup volumes to Apple standard volumes before attempting to install Mojave.

But iMac Pros boot off a two flash SSD RAID don't they? I mean I know they do (I thought). Is that not a RAID? The 4TB version contains two 2TB m.2 SSDs. Or is it a JBOD? Strange.

Thanks,
Steve

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Posted : 01/10/2018 5:40 am
(@softraid-support)
Member Admin

The iMac Pro has a second channel for the NVMe blade. It appears as a single disk to the OS.

It is not RAID, however.

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Topic starter Posted : 02/10/2018 3:14 am
 Nubo
(@nubo)
Eminent Member Customer

Currently I have this setup:
- iMac 21, 2015, 1TB fusion drive (28GBSSD/5400 HDD)
- Thunderbay mini, 4*250 GB SSD, thunderbolt 2, with softraid lite 5.7, (4*SSD in RAID 0)
I use the Thunderbay as a startupdisk/main drive and the fusion drive as a backup disk (carbon copy).

Because Mojave doesn’t support booting from RAID volumes:

- Should I stay with the setup as it is, and consequently stay with High Sierra?

Or maybe:

- Use one SSD in the Thunderbay as a startup disk, the three others in RAID 0 as home/data drive, the internal fusion drive as backup and upgrade to Mojave? I read some negative posts on speed of external SSD’s in APFS?

or?
thanks!

Another possibility is to split the fusion drive into its 2 component drives. 24GB is more than enough for an OS installation. You could boot off of the NVME, keep your data and apps on the RAID, and back those up to the HDD. You could also carve a small partition on the HDD to maintain a carbon copy of the tiny install volume for boot redundancy.

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Posted : 02/10/2018 2:43 pm
(@softraid-support)
Member Admin

One caution:
I have seen that Disk Utility often wants to take over Fusion drives and reconfigure the drives. Just a warning. I last saw this a couple years ago, so perhaps this is no longer an issue, but it is worth watching out for.

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Topic starter Posted : 03/10/2018 12:31 pm
 heke
(@heke)
New Member Customer

Thanks for the advise,
I went for:
- one SSD in the Thunderbay (managed by Disk Utility) as a startupdisk (APFS/non raid)
- my home directory on the other three SSD's in a Softraid RAID 0 (managed by softraid)

-backup: carbon copy of the startupdisk and the home directory both on a separate partition of the internal fusion drive.

After the update to Mojave, the startupdisk was APFS, the RAID and Fusion drive are still hfs+

I'm using this setup for a few weeks now and everything is going fine, only slightly slower than before with the RAID 0 as a startupdisk/home directory, but definitely a lot faster than the internal fusion drive.

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Posted : 06/10/2018 5:10 pm
(@softraid-support)
Member Admin

Apple engineering management seems to think RAID is unnecessary for their customers. Its being decided that Apple customers are not power users, do not use servers, mission critical work, etc. These power users are Apple's most loyal and vocal customers, unfortunately.

too bad.

thanks for the replies, I think many users will do a combination of Carbon Copy Cloner (or alternative) and RAID on data storage.

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Topic starter Posted : 06/10/2018 6:13 pm
(@melorama)
New Member Customer

Are there any hardware RAID based solutions for booting from a Mirror volume on Mojave?

I work in video production, with clients sitting in the room with me all day on really tight deadlines, so the lack of ability to boot off a mirrored volume can be catastrophic (SoftRAID has already saved my butt in this regard on 2 occasions in the past 2 years). Of course I can boot from a cloned volume, but that means I'd be working with stale data on the boot volume, which is less than ideal.

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Posted : 14/06/2019 2:50 pm
(@gabe0071)
New Member Customer

With the release of 10.14 Mojave, users can no longer startup from RAID volumes. This includes any SoftRAID volume and Apple RAID volumes.

There is no workaround for this, and we do not expect there to be a solution going forward.

We had several discussions with Apple to see if they would re-enable booting in the future, but the chances are slim to zero.

Prepare to migrate your startup volumes to Apple standard volumes before attempting to install Mojave.

CCC Restores Apple RAID seen as non-RAID and in About this Mac just no seen.

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Posted : 15/07/2019 12:58 am
(@softraid-support)
Member Admin

If CCC can make a Apple RAID bootable, great. SoftRAID cannot, as Apple does not allow non Apple drivers to startup any longer. I believe I tested this in earlier Mojave builds and it could not startup. Maybe something changed.

I think you are saying it starts up, but the storage volume pane does not show it?

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Topic starter Posted : 15/07/2019 3:01 pm
(@petewilson)
Active Member Customer

With the release of 10.14 Mojave, users can no longer startup from RAID volumes. This includes any SoftRAID volume and Apple RAID volumes.

There is no workaround for this, and we do not expect there to be a solution going forward.

We had several discussions with Apple to see if they would re-enable booting in the future, but the chances are slim to zero.

Prepare to migrate your startup volumes to Apple standard volumes before attempting to install Mojave.

I had a half-formed thought about this, having tried the trick of booting from an 'ordinary' disk and having my user folder on a separate external SoftRAID volume. This works OK, but seems to have hidden horrors - for example, if you tell Time Machine to back up the boot disk, it mutters that the user folder is somewhere else, and **silently** doesn't back it up. (You get to discover this when your RAID dies - luckily it was RAID 5 and a new disk fixed the problem. But...)

So - the half-formed thought: Is there some automatable way of creating a SoftRAID volume in which one RAID volume and N (N= number of disks involved, or less) independent bootable volumes are created. The automation is to keep these as small as possible, with all the data+apps residing on the RAID volume, through some cunning 'aliasing' on the independent volumes.

Example - I want a mirror RAID with two disks. The SoftRAID volume creator makes three volumes - two identical ones to as ordinary boot able drives, one big RAID volume. The user uses CCC or equivalent to clone her current boot drive (here assumed to include all apps, users data etc) to the new RAID. When completed, she goes back to the SoftRAID app and asks it to clone to the bootable drives. SoftRAID 'clones' the minimal bootable system from the RAID to the two independent volumes, with aliases/soft links/whatever works to the stuff on the RAID volume.

Now tell your Mac to boot from one of the independent volumes and you should feel like you've booted from a RAID volume. All apps and data are RAID'ed. You have two independent identical minimal bootable drives for some protection/recovery if one drive or the other commits suicide.

Like I said - half-formed thought. Please ignore if totally ridiculous - but if there's a germ of a workable idea there please make it happen (as soon as the APFS stuff is up and flying). I **really** want to be able to boot from a softRAID disk. Else I'm stuck with expensive RAID enclosures...

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Posted : 08/08/2019 8:03 am
(@softraid-support)
Member Admin

The fundamental principal is the partition map on a disk dictates what driver controls/manages that disk.
You can not have two drivers controlling the same disk.

So when a disk is in SoftRAID disk format, then the SoftRAID driver controls it and all volumes on the disk. So, if Apple says no third party startup disks, there is no way around it.

Users do set their user environment on SoftRAID volumes, which works.

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Topic starter Posted : 08/08/2019 12:40 pm
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