Poor striped all-SSD pool speed with iSCSI over 10 gbps

[guemi]

Hello friends!

We recently acquired a small Fuijitsu PRIMERGY RX1330 M4 for our small truck repair location to run a few of their systems.

I stacked it with 4x Samsung 870 EVO Sata 4TB SSD's and made a Raid-Z1 pool.

CPU: Xeon 2224 - 4 core
RAM: 64 GB 2666 mhz
OS: TrueNAS Scale - Latest stable

When connected over 10 gbps in the same switch to another server over iSCSI I was getting 800 MB/s read, 600 MB/s write which I felt was very low for the configuration.
I figured it might be the raid configuration, so I made a striped pool and tried again, same result.

The system connecting to iSCSI is running a Threadripper PRO 5955WX so that is most definitely not the issue.


Any tips on finding the bottleneck?

 

[NugentS]

You need to seperate the disk performance from the network performance.
First test the network performance with iperf
Then test the disk performance with FIO, testing both high and low queue depth.

Then consider the results