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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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Non-Destructive Split Mirror
Probably easy but can't find anywhere. What is best practice for splitting a SoftRaid Lite RAID Mirror volume non-destructively into two identical non-mirrored volumes?

If it makes a difference, the exact configuration is a cheese grater Mac Pro 5,1. Two internal 4TB HD's each partitioned into 250 GB and 3,750GB. Then the two 250 GB volumes are combined into a 250 GB SoftRAID RAID 1 Mirror. And the two 3,750 GB volumes are combined into a 3,750 GB SoftRAID RAID 1 Mirror.

I want to non-destructively split the 250 GB SoftRAID RAID 1 volume into two identical 250 GB volumes that can be converted back into standard HFS+ volumes.

And to do the same thing with the 3,750 GB SoftRAID RAID 1 volume.
There is no destructive way to split a mirror. When you use the "Split Mirror" command, you will end up with two identical volumes on the desktop. If you choose Read Only Secondary, the second volume will be read only. (and could be added back to the primary later on)

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