Hello everyone,
Maybe you can help me with my problem, all the other contributions I have found so far in the vastness of the Internet have not been able to solve the problem.
A small spoiler in advance:
The text is translated with "https://www.deepl.com/translator", (not sponsored 
) I think that makes it a bit more understandable than if I try it myself.
Answers in English are of course no problem.
I have a Raspberry Pi 4 with OMV installed. A 2.5" HDD is connected. Sharing in the home network via SMB. The entire home network is designed for 1Gbit/s, including switches, cabling and network cards.
The write speeds also match: From Windows 10 -> RPi-OMV = ~110 MB/s.
Unfortunately, the read speeds are much lower: From RPi-OMV -> Windows 10 (SSD) = 35-55 MB/s.
I tried the transfer with different end devices, also under Linux. The values were always nearly the same.
I don't understand why the transfer from the NAS to Windows/Linux is so much slower than the other way round. Actually, it reads from the NAS HDD, which in my opinion should be faster than writing.
I will list more technical data below and also what I have already tried.
I hope I can still get everything together so far...
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Raspberry Pi 4 Model B Rev 1.5
Original Manufacturer power supply
OS: Raspbian lite (64bit)
Linux version: 5.15.32-v8+
OMV version: 6.0.21-1 (Shaitan)
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Storage:
OS (MicroSD): 64GB SanDisk Extreme
Data (HDD): 2.5" / USB 3.0 / 4TB / XFS / write cache enabled
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I have also tested with an external USB 3.0 3.5" HDD with external power supply, here I achieve a read speed of ~60MB/s.
I have tested all extras in the SMB settings and shares as far as I know, but this has not helped.
I have attached a screenshot of the share.
I also ran "$ sudo hdparm -t /dev/sda1". The results are exactly as I would like them to be:
/dev/sda1:
Timing buffered disk reads: 356 MB in 3.01 seconds = 118.22 MB/sec.
I must have forgotten some important info, please let me know.
Greetings from Germany, I am grateful for any help.