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How to use a SoftRAID startup volume with High Sierra

If you're using High Sierra, and booting up from a SoftRAID volume, you'll need to follow the steps given in this forum post, since the macOS High Sierra Installer does not recognize SoftRAID volumes as valid startup volumes.

Hello There, Guest! Register
Trying to replace HD in RAID 01 Softraid Lite ?

One of my HD's failed in OWC thunderbay, 2 TB RAID 01 setup, OSX 10.13.4
Computer crashed and hung, HD could only but physically unmounted because after initial restart SoftRaid frooze and again computer crashed.

Mounted new 3 TB HD in OWC Thunderbay, restarted, computer works again, initialized HD in SoftRaid, but I'm not able to 'Add Sec Disk' and rebuilt the RAID.
I'm constantly getting error message :

'There are no SoftRaid initialized disks which have enough free space etc..'

See attachment.
Any tips much appreciated how to properly rebuilt my RAID 01 again.
Thanks you,

Attached Files Thumbnail(s)
This is one of two issues:
You already created a volume on the new disk. (delete it)
the new disk is slightly smaller than the original. (resize the volume to reduce it in size)

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