Sudden Drop in Speed

Hi,

I've been running OMV (5.5.19-1) for a while. Until a few days ago I was getting around 80MBps (average) transfer speeds on my desktop. All of a sudden (I've not changed anything save doing to the usual apt update && apt full-upgrade) I'm now only seeing 10MBps max transfer speeds and I can't work out what's caused the sudden slow down. I rebooted OMV, the desktop, the network switch and the router and nothing's changed.

I've ran fstrim / with no luck and I've tried on other devices to see if its just my desktop and I'm actually seeing even worse performance over wifi at about 600kbps to my phone which previously was getting between 40-60MBps over wifi.

I've got the below options configured in the extra options section for samba

In the extra options on the samba settings page:

socket options = TCP_NODELAY IPTOS_LOWDELAY
min receivefile size = 16384
use sendfile = yes
write cache size = 524288
getwd cache = yes

In the extra options for each samba share:

log level = 1
socket options = TCP_NODELAY SO_RCVBUF=65536 SO_SNDBUF=65536
read raw = yes
write raw = yes
max xmit = 65535
dead time = 15
getwd cache = yes

I've tried removing all these settings but it actually gets worse dropping to about 3MBps!

Below are the results from iperf3 which seems to be getting the speeds I'm expecting between the computer and the NAS but I'm just not seeing the speeds in samba.

Connecting to host 192.168.1.130, port 5201
[  5] local 192.168.1.239 port 59920 connected to 192.168.1.130 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   114 MBytes   955 Mbits/sec    0    392 KBytes
[  5]   1.00-2.00   sec   112 MBytes   943 Mbits/sec    0    430 KBytes
[  5]   2.00-3.00   sec   112 MBytes   943 Mbits/sec    0    472 KBytes
[  5]   3.00-4.00   sec   112 MBytes   940 Mbits/sec    0    472 KBytes
[  5]   4.00-5.00   sec   112 MBytes   942 Mbits/sec    0    472 KBytes
[  5]   5.00-6.00   sec   112 MBytes   939 Mbits/sec    0    472 KBytes
[  5]   6.00-7.00   sec   112 MBytes   941 Mbits/sec    0    472 KBytes
[  5]   7.00-8.00   sec   110 MBytes   922 Mbits/sec  425    598 KBytes
[  5]   8.00-9.00   sec   106 MBytes   891 Mbits/sec  216    428 KBytes
[  5]   9.00-10.00  sec   112 MBytes   944 Mbits/sec    0    428 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  1.09 GBytes   936 Mbits/sec  641             sender
[  5]   0.00-10.00  sec  1.09 GBytes   933 Mbits/sec                  receiver

OMV is running on an ODroid XU4 with 2 WD 10tb drives attached (https://www.amazon.co.uk/gp/pr…_asin_title?ie=UTF8&psc=1)

Any help getting back to the original speeds would be much appreciated!!