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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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SoftRAID (issues)
#21
(01-10-2019, 06:28 PM)Superstudio Wrote: *Also, the 4M2E is daisy chained through a Pegasus3. They are the only 2 units on this TB bus.

We have quite a few Pegasus RAID's at the studio, and have had some very strange issues with them. We've found that the thunderbolt connectors are not to spec, and the official Apple cables are the worst fits. We use cheap aftermarket cables to stop RAID's from hanging systems, randomly disconnecting, and causing data corruption.
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#22
Great point.

There is a lot that can cause thunderbolt bus resets, and cables are certainly one of them.

These buses are incredibly fast and it does not take much to create communication issues.

The biggest problem with Thunderbolt cabling is the "feature" that powers off the drives as soon as a cable disconnect is detected, which exasperates this issue.
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