Copying Data over the Network crashes my truenas scale cpu and network connection

[techchrix]

Hi together,

i have a really stupid problem and hope someone can help my out of this disaster.
I setup a new trunas scale system (switch from QNAP to truenas). This are my server specs:

TrueNAS-SCALE-23.10.2
CPU: Intel(R) Core(TM) i5-14600T
Mainboard: ASUS PRO WS W680M-ACE SE
RAM: 2x 32 GB Kingston ECC (KSM48E40BD8KM-32HM)
CPU Cooler: be quiet! Dark Rock 4
Power: 1x Thermaltake Toughpower PF1 750W, PC-Netzteil
SSD boot 2x m.2 SSD Force MP510 mirrow
SSD DATA: 2x SSD SAMSUNG_MZ7L37T6HBLA-00A07 mirrow
Backup: 2x ST22000NT001-3LS101 mirrow

What is going on:
If i copy data over the network to my Truenas (SSD Data), the system is coping data with ca. 200MB/s.
The CPU Avg Usage is ca. 5%. After a few seconds the CPU avg usage picks to 60%, 70% sometimes 80% and
the hotest core to over 75°C. Than the speed of the data transfer drops to near 0. A few seconds later the avg usage drops again
to 5% and the speed of the data transfer go back to 200MB/s. This is happing permanantely avery few seconds until the data transfer is finished.
The idle temp of the hottest core is 34°C so it seams not to be a colling problem. I never saw a system using so much spu resources for symple data
transfer over a 2.5GB ethernet.

I will be very thankfull for any ideas where the problem can come from.

Thank you very much
BR
Chris

 

[techchrix]

Short Update after some Testing....
It is not related to the compression lavel because i tryed this out also with completly disabled compresion.
It is also not related to deduplication because there are no improvments without dedublication.
Compering tke backup and data dataset i find out that the bakcup dataset performing much better and using less cpu
resources than the ssd dataset. Thi smakes for me also not much sense :-(
Maybe Truenas can not handle the Samsung Datacenter SSD's.