Raid 5 40MB Write Speed

[housemd84]

Have a Rock Pi 4A 4GB, running ubuntu 18.04. Added Gnome Desktop to see what I was doing. Got everything created and working with 4 8TB NAS Drives. In a computer I saw 80-100MB Write performance with the same drive, I only get 40-45MB With the Penta Hat. What should I be looking at to improve speeds? I got these speeds whether copying over gigabit ethernet OR using Esata to copy directly From Drive.

[eskimo]

samba overhead causes write speeds to drop to 30-40mb…

[housemd84]

Really. That Much. Does what I am getting sound right then? I am never maxed on CPU or Memory

[quadnas]

I had a thread about write speeds in general, not Raid 5 but still relevant:

Write speeds JMS561

I was wondering what speeds people are seeing when writing to discs over the JMS561? The spec says they can do 400 Mbytes/s however I am seeing significantly less. My setup: Macbook wired to Pi over gigabit switch - 940 Mbit/s with iperf (~117 MByte/s) 4TB WD Red NAS HDD - Max 150 Mbyte/s JMS561 SATA Hat on Pi - 400 Mbyte/s spec Samba share from Pi to Macbook Taking overhead into account I would expect something around 100 MByte/s when writing over the network, however I am only seeing bet…

I use samba as well and I get ~110 Mbyte/s to a single HDD.

[housemd84]

Interesting read. I am 99% sure I am not using ntfs but will verify.

[Ouafnico]

I got exactly the same problem. With standalone disks, I can’t go over 40MB/s on hat. Tested directly with dd.
It’s so slow!

[housemd84]

So. My issue was I was transferring from a ntfs drive and that caused my issue. Going to and from Linux based files systems I have killer speeds now.

[Ouafnico]

Yes, but i’m not using rockpi 4a but a raspberry pi 4. Maybe that’s the difference?
I will create a specific topic