P.S. I also talked to a customer in the past who stored their backups in an SSD-only Ceph cluster. They were citing higher reliability of SSDs and higher density, which was important because they had very limited physical space in the datacenter. In other words, traditional 3.5" HDDs would not have allowed them to store that much data in that many rack units.
But they're not great for low cost bulk storage. If you're putting together a home NAS, you probably want to do well on $/TB and don't care so much about transfer speeds.
But if you've found 10TB+ ssds for under $200, let us know where to find them.
An 8 TB SSD is >$600
$80/TB vs $20/TB is a four fold increase.
Also a 16 TB drive is $2,000 so more like a 5x increase in a data center setup.
Best I've found so far is cards like this[1] that allow for 8 U.2 drives, and then some M.2 to U.2 adapters like this[2] or this[3].
In a 2x RAID-Z1 or single RAID-Z2 setup that would give 24TB of redundant flash storage for a tad more than a single 16TB enterprise SSD.
[1]: https://www.aliexpress.com/item/1005005671021299.html
Perhaps it will be realized with higher PCIe versions, given how tight signalling margins will get. But the big guys have money to throw at this so yeah...
Lame