I'd love to know how you do this, sounds an interesting idea. Please explain a bit.
1. Mac mini M2 (or any modern Mac with a USB 3.2 Gen 2 port)
2. Four of these 4TB SSD's at 2000MB/s:
or these at 1000MB/sec:
Although you can get them for eBay for MUCH cheaper. Like up to $150 less. Since we're doing mostly reads and few writes with a movie server, having used ones is just fine with me. You can also get the non-Pro versions that do 1000MB/sec (still very fast!) for even cheaper. I went with 2000MB/sec Pro for future proofing if Apple ever adds USB 3.2 Gen 2x2.
3. A USB 3.2 Gen 2 hub:
https://www.amazon.com/gp/product/B0BTNTZ4BW/
Finding a reliable and large powered USB 3.2 Gen 2x2 is hard, so I just went with this since the Mac USB doesn't do 2x2 either.
4. 16TB HDD backup for the SSD's:
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After you get the equipment and plug it all in and format it:
1. Update the SSD firmware with this to prevent data loss. Most on eBay do NOT have the firmware updated:
Instructions to update your SanDisk & WD Portable SSD storage device. Follow these steps to update the firmware on SanDisk Extreme V2, Extreme Pro V2, and WD My Passport.
support-en.wd.com
2. Span the hard drives into one single drive using Disk Utility like so (see JBOD):
Use Disk Utility on your Mac to create a Redundant Array of Independent Disks (RAID) set, multiple disks that work as one disk.
support.apple.com
3. Set up Carbon Copy Cloner to auto create backups from the SSD span to the HDD:
bombich.com
4. Install Plex and you're good to go.
Movies on SSD means you can stream in your or out of your house at full quality with multiple streams with no lag or slowdown. Movies start instantly, and fast forwarding is super quick. Personally, I got 2.5Gb Ethernet switches, MoCA 2.5Gb Coax adapters, and 2.5Gb USB Ethernet jacks for my whole house. I can stream a 100GB REMUX 4K HD Blu-ray file (with basically means a lossless 4K movie) in my house with zero lag to my Apple TV's from my movie server.
I can essentially make a super-fast SSD as big as I want this way for REALLY cheap.