I believe SS Parity would have usable (not great performance) in right conditions. I'm planning a large backup repository based on a SuperMicro 60-disk chassis with 6 NVMe SSDs.
* 64TB volumes with maximum column size (17)
* Increasing chunk size (512K, 1M...)
* SSD write cache with 100GB Write Cache per volume (6*2TB SSD with high DWPD such as Intel P3700)
* Setting IsPowerProtected flag to allow relaxed caching and flushing. While it increases corruption risk on power failure, I'd say its a reasonable compromise with dual power rails with independent UPS and a generator.
With 10TB disks and a few SSDs I'd expect total write throughput of at least 3GB/s (conservative) over 10 or so volumes. While not great, it's reasonable and likely to choke SANs and FC/10G. And price-performance-density-power ratio would be pretty good.
Some guy did some testing here http://vault-tec.info/post/129360770011 ... sis-part-1
With some tuning... it could work but only at big scales with you start to max out networking.