Erratic Transfer Speeds to Home-Build Truenas NAS

Hi all,

So I have a a custom truenas NAS with three 8tb disks in Raid-z. When it works, it works very well. I have a windows laptop so I’m using the fastest adapter I could find (QNAP 5gbe) which despite because 5gig actually maxes out at around 3.5gbe. Which is fine for me. Most of what I’m doing is moving around large video files for my small business.

When it works, it will hit the 3.5gbe sustained and complete the job without issue.

When it doesn’t work, accessing the file share through explorer becomes laggy (blue loading cursor appears when clicking into a folder, etc) and the transfer speed will go from max 3.5gbe all the way down to zero. Like a rollercoaster.

At first I thought it was the adapter malfunctioning, but I switched to using the inbuilt 1gbe adapter on my laptop and it does exactly the same thing, going from the peak of 1gbe down to zero.

I’ve attached an image of a recent transfer from the inbuilt adapter to give you an idea of the instability of transfer speed.

It’s very strange and nothing in particular seems to trigger the works fine / serious instability switch. If anyone has any ideas / suggestions would be much appreciated!

Screenshot 2022-11-09 111854

If your laptop goes laggy I’d suspect that your CPU maxes out (maybe even on one core) rather than TrueNAS being the issue.

No the laptop is fine. It’s a ROG zephyrus 2021 with a beefy ryzen 5000 in it. The laggy part is windows explorer trying to load in files from the NAS, everything else works as normal

Did you have a look at CPU load on one core and interrupts? I see this behavour on my old laptop where one core can’t keep up with transfer rates. You could also have a look at gstat on your TrueNAS box at least if you’re running Core/Enterprise.