4-Disk Btrfs Native RAID Performance On Linux 4.10
RAID0 didn't help the SQLite performance while this embedded database library did see noticeably slower performance than a single-disk configuration with 2-disk RAID1 (less so with 4-disk RAID1) and then four-disk RAID5/RAID6.
At least RAID0 was working well for boosting the FIO scores.