I finally got around to setting up a new VM host (Debian 7.7 x64) with SSD-based Linux RAID. I'm using four inexpensive 120 GB SSDs. The Disk Utility read benchmark for the individual SSDs is 0.2-0.6 GB/s (average 0.5 GB/s). There are two RAID10 arrays. One (md0, at the beginning of the SSDs) holds /boot. Its read benchmark is 0.4-12.8 GB/s (average 1.1 GB/s). The other (md1) holds a dm-crypt/LUKS volume, and that is used for LVM (swap, /root and /home). Its read benchmark is 0.3-1.0 GB/s (average 0.8 GB/s). That all seems vaguely reasonable, although the shapes of the read rate vs % capacity curves are rather strange. The machine isn't at all remarkable (3 GHz i5 x4 with 8 GB RAM). But the improved disk performance is obvious. Still, I'm left with some questions. My main goal here is getting speed and capacity from small inexpensive SSDs. I'll be picking good models from good manufacturers, but focusing on small ones that are being phased out, and selling at discount. I've read that SSDs generally have much lower URE rates than HDDs. And so I'm tempted to experiment with large RAID6 arrays. I'd love to try RAID50 or RAID60, but I'm not sure that's doable (or wise) with Linux software RAID. What am I missing, that might come around to bite me?