Hello everyone, just finished building my truenas scale server, for some reason the smb transfer speed is super low, only getting around 20mb/s. The system has 4 wd redpro 18tb drive in a raidz1 config. It is connected with a 1gb and a 2.5gb ethernet. While I am transfering the file I can see from t…

The system uses the N5105 board 4 Port i226/ i225 2.5GbE LAN,M.2 NVMe, 6SATA3.0,2DDR4, 1*PCIe4.0. The system has 64GB of ddr4 ram. The dd test and zpool status test was done in truenas web portal. The iperf test is conducted between my linux machine and the truenas server, they are connected with as…

Intel i225 has been problematic. Intel i226 has been okay and is a recommendation on the forums. Your iperf test is slow and not near a 1Gbps connection speed. I would expect 800-900 Mpbs. Looks like a network issue

Here are my iperf3 results. Windows 10 to TrueNAS. I have 1Gbps and 10Gbps networks. I did have to run the 10G test twice as the first run was really low. Reported about 1.3Gbps 1 Gig [1GbpsNetwork] 10Gig fiber [10GbpsNetwork]

iPerf suggests to me that your network is OK - though on the 1Gb I am a bit worried about the retry counts. However, your method for attempting to benchmark the disk performance is completely flawed. ZFS is a complex file system with lots of performance enhancements and if you want to benchmark it …

Are you commenting about the iperf test for the OP? I just did the two screenshots so the OP could get an idea of what the two different network speeds test at compared to the original post.

Oops - yes I was. So ignore the bit about network tests being good. OP needs to run iPerf to see whether it might be a network issue first. If it isn’t we can look at his disk setup.

I did run the iPerf here is the result, [SUM] 0.00-10.00 sec 676 MBytes 567 Mbits/sec sender [SUM] 0.00-10.02 sec 666 MBytes 558 Mbits/sec receiver It is slower than the 1G rate I am suppose to get however I suppose it does not really explain why my SMB is so slow I am only getting 26Mib/s. I tri…

If you want to describe your end-to-end network between TrueNAS and your Windows box, we can try to work out why it is slower than you would expect.

Did you leave the Pool & Dataset options the defaults? Snip from CORE verison [image]

Super slow SMB speed

TrueNAS General

SmallBarky November 20, 2024, 3:19am 2

We need better hardware details and your network setup. Brand and model of NIC really helps. Connection speeds. Make sure you keep MB and Mb correct when postings. Models of HD may make a difference. We are looking for all drives to be CMR and not SMR tech. Details on how you are testing between devices helps.

Topic		Replies	Views
Can't surpass 120mb/s on Scale after trying everything (I think) TrueNAS General	19	411	September 13, 2025
Subpar Performance, Link State (not) Down, Intermittent iPerf3 Connection TrueNAS General SCALE , SMB , ZFS	13	254	May 1, 2025
Slow RaidZ1 Read/Write Speeds (20 mbps) TrueNAS General SCALE , ZFS	10	1041	October 13, 2024
Upload Speed extremely throttled TrueNAS General	16	887	October 29, 2025
POOR SMB / Samba Performance TrueNAS General	13	389	July 4, 2025

Super slow SMB speed

Related topics