Originally Posted By: khaidir77
how to do raid in High Sierra Beta?

Assuming you have the correct hardware, ideally two or more matching internal drives or in an external RAID enclosure go to Disk Utility > File > RAID Assistant and select the drives to be used in the array and choose RAID 1, RAID 0, or JBOD. After that the array is accessed the same way as any volume.

NOTE: JBOD is technically not a RAID configuration, it is a concatenation of two or more drives into a single volume.

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