Disks Controller Bandwidth

[ldrax]

Right now I'm running 4 concurrent file copy operations.

Command used: rsync -avPX /source /destination
Parity: disabled (unassigned)
Thread 1:  from disk 3 -> 2
Thread 2: from disk 4 -> 1
Thread 3: from disk 7 -> 8
Thread 4: from disk 9 -> 5

I'm only getting about 30MB/s for each of these 4.
Tried both recontruct write and Auto on Disk Settings, results are the same, but I figure since parity is disabled, this doesn't matter.

If I run just 2 operations, speed of each would be around 45 - 55 MB/s.
The disks are connected to SATA ports on motherboard and some to LSI 8i RAID card (PCIE3 x4).

Does this mean that as a whole, my entire build's disk bandwidth is only about 100-120 MB/s ?

A while back I did an rsync from most of these disks, one disk at a time, to another unRAID build, the max speed was around 120MB/s, but I figure that's the max of my gigabit LAN speed.