Slow write speeds after migration to new hardware

TrueNAS General
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1

Hallo,
I had an truenas NAS made of an outdated PC with i7-4770 U with 8GB ob RAM.
No I set up a new truenas instance on the same SATA SSD than the old system used, put in the unchanged Data Pool (2xSpinning SATA), imported the configuration file from the old system and everything worked.

But on the old hardware when copying big files (e.g. a film) I could get around 100 or even get 110MB/s.
With the new NAS hardware I start with 113MB/s slow down to 40MB/s, slowly increasing to 100 for a short time and than falling back to 40 again. (Other files stay around 30-50MB/s)

Same configuration, Same disks, 4x more RAM, newer CPU.
(old: 4Cores, 8threads, 3,1-3,9GHz, new 4cores, 8threads, 2,2-3,2(4,1)GHz.
What could be the reason why my new system works such bad?

Tests was done with SMB share to a windows machine.
From NAS to WIN: constant 113MB/s (1,9GB File in ca. 17 sec)
The same file from Windows to NAS: sped going up and down 40-113MB/s (time needed: 25 sec)
NAS would have 2,5GBit/s, Switch and Networkcard on Win still 1GBit/s

Thans for your help!!
Best regards
Chris

HomeNas - TrueNas Scale 24.10.10
CPU: Inte i3-12100T 4x2,2GHz
RAM: 2x16GB DDR5-5600 “On-die ECC” Kingston
MAINBOARD: ASUS ROG Strix B760-I Gaming (Mini ITX)
PSU: BeQuiet Pure Power 12M 550W (ATX)
BOOTPOOL sdc: Samsung_SSD_870_EVO_500GB, SATA
VDEV Data: 2x12TB Seagate Exos X16, 12TB, 7200RPM, SATA
Free: 2x Nvme, 1x SATA, 1xPCIE

2

Whats the CPU usage like ? SMB is single threaded and favors high clock speeds. Maybe the CPU is running into its TDP limits…

Second reason could be the 2.5Gb NIC. 2.5Gb is wonky…

3

Ooooo, not just wonky,. are you sure you are connected at 2.5gb? My system with Scale drivers will only connect at 1gb or 10gb, so if plugged into a 2.5gb switch, it connects at 1gb.

4

Sorry, maybee I wrote it to confusing. It is 1GBit Speed, as Switch and PC NIC is 1GBit

5

Hallo, Thanks a lot for the answer!
CPU usage is lower than 20%.
So I uess it is not running into TDP linits, but how could I see the actual power used, or is the % from the dashboard enough.
Additionally I had a look at netdata,and this showed the same.

Interesting is that in one direction from NAS to PC the speed is much faster that writing to the NAS.

Best regards
Christian