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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.


Getting the Correct setup
#41
What is a "RADAR" bug? Something on the Apple Dev site, perhaps? No, I haven't done that... Yet. Didn't you? Maybe that's why no one knows...
Macbook Pro Retina 2017 internal 500GB storage, 16GB RAM
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#42
It is how developers report bugs, yes.

We did report this, but we would tie our report to yours had you posted in in RADAR.

thanks!

I assume you just reported it to Apple customer service, then?
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#43
Yes AppleCare Support. They said they'd be escalating it. We'll see. I have another avenue as well.
Macbook Pro Retina 2017 internal 500GB storage, 16GB RAM
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#44
Henry, I appreciate your question, too.

Which would be the best setup (faster & safer) with the following:

2- 256GB PCIe SSD Flash Blades
1-240GB SATA SSD
2-2.0TB SATA HHD

RAID 4
2- 256GB PCIe SSD Flash Blades
1-240GB SATA SSD

RAID 1+0
2- 256GB PCIe SSD Flash Blades
2-2.0TB SATA HHD
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#45
The Flash Blades are higher performing than standard SSD's. So a 3 disk RAID 4, would designate the SSD as the parity device, to get fastest performance.

On a RAID 1+0 volume, SoftRAID will automatically pick the HDD's as secondary disks and read only from SSD on reads.
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