Slow-ish speeds over SMB

Hey guys,

I run OMV on my RPi4 (4GB) and no matter what I do my file transfers wont get faster than 35-37 MB/s. I tested the network via iperf and it is fully capable of Gigabit speeds. Tested the external hard drive and got well over 100MB/s. The external drive is formatted as ext4. Tested via FTP and I am getting roughly 110MB/s. CPU is at around 40% and temps are at around 49C, so no thermal throttling. Everything is patched to the latest versions

Currently I am running the following config:

socket options = TCP_NODELAY SO_RCVBUF=65536 SO_SNDBUF=65536
read raw = yes
write raw = yes
max xmit = 65535
getwd cache = yes
max protocol = SMB2
min protocol = SMB2

As I said: Speeds are stuck at around 35-37 MB/s, even slower if I go to SMB3. If I transfer files from a Linux laptop to the NAS it gets slightly better, but still not above 50MB/s

Anybody got any ideas why my smb speeds seem to be so slow?

Cheers and thanks for the help!

Yeah I tried this configuration running already, but no luck. Still 32-35 MB/s

Sorry, didn't see that. I think you mean the lsusb results right? Looks like this on my machine:

/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
    |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M

Thanks for the reply. Unfortunately I just bought this 4 bay enclosure, so replacing it isn't really an option for me. I guess that means I am stuck with this for the time being

The model is the Fantec QB-35US3-6G. There is also the Fantec QB-35U31 available that allegedly has support for UASP

I contacted the seller and since I haven't done anything but peeled of the plastic, so I hope he will accept a return, even though I am over the 14-day return period that is mandatory in my country

Update: I upgraded to the model with UASP, but still no better results. With the new model the lsusb looks like this:

/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 5000M
        |__ Port 1: Dev 6, If 0, Class=Mass Storage, Driver=uas, 5000M
        |__ Port 2: Dev 5, If 0, Class=Mass Storage, Driver=uas, 5000M
        |__ Port 3: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
        |__ Port 4: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 3, If 0, Class=Hub, Driver=hub/5p, 480M
            |__ Port 5: Dev 4, If 0, Class=, Driver=, 480M

Only two drives are currently populated in the enclosure. Still get speeds around 30-35 Mbit/s

Yes. Set exactly the same as the settings in the first post of the linked thread

The might be the prime suspect. Indeed I grabbed a USB-C cable I had lying around, but I don't know what it is from and how good the quality is. So I guess I'm gonna order another quality one and see what happens