Given the comments regarding the cost of true hardware RAID in some of my searches like here or here, it would appear that $500 solutions like Synology DS413, Netgear ReadyNAS Ultra 4, QNAP TS-419P must use software-based RAID. True? Are they using a hybrid hardware-software combo?
All manufacturers appear to offer some proprietary version of expandable RAID (Netgear X-RAID, Synology Hybrid RAID, etc). I believe these boxes run Linux inside, are these proven Linux software RAID algorithms that the manufacturers are branding, or truly proprietary? Any less reliable than tried-and-true RAID-1, 5, 10, etc?
I would just like to understand the internals of these machines a little better before trusting them with terabytes of important data. Thanks.