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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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Max volume size 4M2 + SoftRaid Lite XT
#1
Installed 4x 1TB SDDs and trying to create Raid 1, it is limited to 1 TB max size (Raid 0 shows 4TB available). All SSDs are the same

Why can’t create new mirrored volume of 2 TB?


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#2
To create a 2TB volume, you need RAID 1+0, not RAID 1. SoftRAID Lite cannot create 1+0 volumes.
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#3
Your answer implies that I would need to create Raid 1+0 but SoftRaid Lite XT included with 4M2 does not support Raid 1+0. So how do I proceed from here? Return 4M2 and purchase another enclosure or spend more $$$ on software upgrade??

I purchased 4x 1TB nvme and 4M2 expecting to get 2TB Mirrored volume as suggested by hardware specifications. Installing 4 disks and getting only 1/4 of capacity isn’t the smartest way to spend anyone’s money.
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#4
The Express enclosure comes with XT Lite. That only supports RAID 1 or 0.
You can create 2 1TB Volumes.
Most users want to use this in RAID 0 for performance reasons.
You could also create both a 2 drive Mirror and a 2 drive Stripe, the stripe would be fast, and 2TB, the Mirror would be 1TB. SoftRAID lets you mix and match volumes.
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#5
If you can afford it, its worth it to upgrade the software to suit your raid needs.
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