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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.

Resize example
#1
Can you post resize command line for SoftRAID non-RAID volume?
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#2
the format for this command is:
softraidtool volume "volumeidentifier" resize "size"

For example, lets say you have a volume, identified by SoftRAID as "disk6", that you want to resize to 500GB

(disable safeguard first, if it is enabled for this volume)

softraidtool volume disk6 resize 500gb

will do it.

Note: You can only resize the last volume on a disk(s).

Example:
you create two RAID 5 volumes. You need to resize them.
You need to delete the last volume. (You can use diskutil list to help identify which was created last)
Backup/delete the last volume.
Then resize the first volume.
Create the second volume again.

SoftRAID does not move data around, or resize volumes "dynamically".
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