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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.

RAID Useable Storage
#1
Is there a table or a post somewhere that shows how much actual storage is available with the different RAID configurations?

I know that two 1 TB drives in RAID 0 will give 2 TB of useable storage, and that two 1 TB drives in RAID 1 will give 1 TB of usable storage. I get that, but what about all the all other configurations?
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#2
Here is how you calculate:

(assuming all drives are same size)

RAID 1+0 = 50% of the total disk capacity

RAID 4/5 = total disk capacity -1 disk

So a 4 disk RAID 5, with 4TB drives = 12TB
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