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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.

Seagate Archive Drives
Was wondering if anyone is using 8TB Barracuda Compute or Archive drives in their Raid setups? I've got a Raid 5 now and want to upgrade it to a 4x8TB setup. Some of these drives are PMR or SMR technology.

I've read that you should use a PMR drive setup. What happens if you use the SMR drives in a RAID?
The problem with these drives is:
1) you cannot certify them, as they slow dramatically when you try to certify them, so essentially you have no ability to determine if they are truly reliable.
2) Any intense writes drop to 40MB/s pretty quickly.

There is no physical reason they cannot work, just that they are really slow and users complain about this.

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