Hello all, I’ve recently acquired two Microserver G8 and upgraded them with Xeon 1265 and 16GB of RAM (the max they can have). I’ve created a pretty large NAS - 4 x 14TB - which I appreciate is beyond the recommended RAM/Storage ratio. My Network is only 1Gbps and they are going to be used as basi…

What do you mean by external SSD ? How was this SSD connected to Truenas ? Or was it connected to the Mac ? Whats your Pool layout for the 4 drives ? I would first use iperf3 to test the max possible networt speed. Iperf3 is available though the command line and there exists afaik also a macos ve…

Thank you for the pointer and sorry if I was not clear. I was transferring from an external USB4 SSD connected to my Mac TO Truenas. I ran iperf3 on the server - and another identical one (just empty) which is sitting on the same switch. They’re both on Raidz1 This is the server in question [SC…

Seems to be at close to 900mbps, looking good from a purely networking perspective imo if you’re using 1gig. I’m confused on what the issue is - interface is in Gigabits per second & it is reasonably close to 1. Then you have disk io for sda at ~100 Mebibytes/s, which is roughly ~800Mb/s. Which is …

I assume so… could have a bunch of reasons. Maybe at that time a lot of small files were transferred which increased the overhead.

In each of the pictures, the top run shows speeds in the 200mbit/s range. So there seems to be a network limitation for these kind of transfers.

Are you worried that speeds dropped from >900mbps to apprx 800mbps after 9:55pm? Yes and it didn’t recover from there Maybe at that time a lot of small files were transferred which increased the overhead. That was a video footage archive, 99% of the files were pretty large. And it seems that …

Fair nuff - that seems like much more of a pain in the ass to diagnose; would be much easier to try & fix dead or much slower link :frowning:

for sure. I wired the outbuilding some time ago, I inadvertently went with an 35m UTP outdoor-rated cable but it’s always been a bit dodgy. It works, but some adaptors will go flat-out 1Gbps, some others will jump up and down a bit. Back some time ago I tested whatever device was giving me issue a…

as a confirmation that the issue is elsewhere, I started a duplication today between the two boxes which are connected to the same switch. It’s clearly an issue with the rest of the network - those periodic drops I’d imagine are expected? But it’s clearly reaching full 1Gbit/s capacity with no hes…

Weird - anything interesting or out of ordinary in the logs? tail -n 500 /var/log/messages | less Any chance of anything interesting in IPMI in terms of temps? Uhh - otherwise donno, reboot switch, reseat connections, retest?

How to diagnose transfer speed

TrueNAS General

ProfessionalAmateur March 7, 2026, 12:06am 15

If it works it might not survive a reboot. There was a post about this somewhere here…

Found it!

There you find the init script they used, if you are unsure how to do that. You can ignore the rest as they are talking about a different issue.

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How to diagnose transfer speed

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