Btrfs RAID HDD Testing On Ubuntu Linux 14.10

For random reads with the Flexible IO Tester using libaio, RAID 0 was the fastest as expected (1.79x the non-RAID, single-disk configuration) while the RAID1 configuration was just 1.47x faster with its random reads.

With random writes, RAID generally isn't too beneficial and causes a performance decrease under Btrfs RAID0.

With sequential reads from Btrfs on Linux 3.16, RAID 0 works great as expected while RAID 1 with its mirroring offers less of a benefit.

Btrfs RAID 0 on Linux 3.16 was taking a hit for the two HDDs while RAID 1 was maintaining the same level of performance.