Slow SMB performance

English Networking
1

Hello All

Im running into trouble, when connecting to my NAS through SMB:
Windows 11 to TS-431XU with QTS 5.2.3.3006 Build 20250108
They are connected through 10GbE Links with a Unifi Switch inbetween.
Reads are 500-800MBps, so hardware seems to be fine. 4 HGST HUH721212ALE604 Disks in RAID5 SSD cached.

I had the issue also with downloads. But after deactivating SMB Signing, the download speed increased dramatically, but the upload still faces 14-15MBps.

Any ideas, what could cause this issue?

2

431XeU does not have dedicated cache slots…so if you use 4 HDDs, how are you using cache?

3

(with the officialy supported, original QNAP PCIe expansion card)
Any contribution to the topic?

4

Cool your jets or I cool them for you

Disable cache and test again…(QTS is broken)

This NAS normally does 200-300MB/s with just the HDDs (So do not expect anything close to 10GbE)

5

grafik
grafik490×315 45.3 KB

Almost same numbers with and without caching in both directions.

6

try a few settings from a post I had done over on the old forums. it may help.

https://forum.qnap.com/viewtopic.php?t=169262

7

i tinkered around a little bit and can nail it down to tcp config issues.
Tested with iperf3
w11 → NAS: 2Gbps
w11 → server2022: 2Gbps
server 2022 → NAS: 6Gbps
Server 2022 ↔ w11: 0.2Gbps

So, its someting with windows 11 and I have no idea what…

8

There is a topic in the German forum that might be of interest

9

Thanks for the hint. I already deactivates SMB-Signing which brought me to faster RX, but TX is still FUBAR.
I now completely switched of encryption - still just 20MBps on the 10G Link

10

I take it your cables are all new CAT6 or are the something else? are Jumbo frames on?

11

Direct Connect SFP+ Copper without Jumbo Frames (on purpose.)
All enterprise grade hardware.