Booting MacBook Pro 13" 2020 from external RAID - Help would be appreciated!

[Digital Nomad]

Have been trying to boot a 13" MacBook Pro 2020 from an external USB-C raid consisting of two Samsung T5 drives

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So far I have been able to

1. Install Catalina 10.15.5 on a RAID USB drive
2. Get the boot picker to recognize the drive as bootable (via disabling secure boot & enabling external boot in the Startup security utility)

If I boot holding the option key I could then pick one of my RAID volumes as the startup drive. When I try to boot however, I get the following message

"A software update is required to use this startup disk. You can update now or select another disk"​

And if I choose to update my disk, then I get the message

"Startup disk is not supported. Select another startup disk"​

Disabling SIP has not helped. Any ideas would be very much appreciated

Petros

 

[matram]

You do not specify which Raid type or what type of RAID system you are using?

If it is a RAID mirror you could try to connect one of the SSDs directly to the MBP?

I am guessing Catalina do not support this RAID configuration.

 

[Digital Nomad]

Thank you - it's a RAID 0 consisting of two T5 Samsung drives connected via USB-C

Catalina does not support booting in RAID in general - but was able to get my MacPro 5,1 to boot from a RAID using the same process.

Suspect the 2020 checks during boot - so wonder if I could disable it