2 SSDs to one partition

Question

I have the same external SSD twice. I would like to save the macOS operating system on these two SSDs so that the operating system recognizes the 2 SSDs as one SSD.

About the same as with a FusionDrive, only the difference is not 1x HDD and 1x SSD but 2x SSD. But this should be a startup volume. So what I can start with.

My thought: Create a JBOD in recoveryOS Install macOS on it and boot on it is that possible?

How do I get it that way?

Thanks

Answer 1

We do this at work all the time with SoftRaid and NVMe M.2 storage. We have never had a case where booting from RAID paid off performance wise, but I’ll take your requirements as having merit.

• https://www.softraid.com/softraid-big-sur-and-the-new-m1-macs/
• https://www.owcdigital.com/products/express-4m2

Remember, raid is not backup. There are many vendors and you generally get the support you pay for. OWC has been by our side for a very long time, so start with them if you struggle to pick a vendor that will support you. You can start with any commodity SSD and stripe them with Apple Disk Utility, but getting better RAID options is low cost and high return for us.

Answer 2

Only two drives would have to be RAID 0.
This is the least safe RAID type of all. Plus it would have to be software, not hardware RAID, so even less stable.

I wouldn't trust it as far as I could spit it, because the first time one of the drives glitches or doesn't hook up to USB just exactly properly first attempt, all your data is gone forever.

After the question edit - trying to make a Fusion drive using two identical speed drives makes absolutely no sense at all. A Fusion drive uses a small SSD as a fast cache to a larger HDD.