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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.

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Trying to replace HD in RAID 01 Softraid Lite ?
#1
Hello,

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,


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#2
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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