Best RAID for mixed drive sizes. Unraid vs BTRFS vs Snapraid+Mergerfs vs Storage spaces.

Got a bunch of spare drives and want a single volume with some redundancy? I take a look at 4 different software RAID solutions and compare the speed, usage space and other features of these solutions. 0:00 Intro 1:14 Unraid 2:45 BTRFS 4:21 Snapraid+Mergerfs 6:18 Storage Spaces 9:21 Testing Results 10:45 Discussing the parity write hole Note: This is a re-upload after a previous version had audio issues. This version is much better, but may still have some glitches. Let me know if you have seen issues like this in resolve, as I don't have these audio issues with playing back, only in the exports.