Very slow network speeds

[AMiGAmann]

Hello,

I have very slow speeds when copying big files to a CIFS share on my FreeNAS. The speed is around 40-60MB/seconds, which is very little IMHO.

Some information about my FreeNAS machine: Xeon E3-1231V3, 16GB Samsung ECC, Supermicro X10SL7-F, Sea Sonic SS-500L2U 500W, booting from mirrored SSDs.

I have one RAIDZ2 vdev containing 8x WD60EFRX. Dedup and compression are deactivated.

I have a link aggregation (loadbalance) configured in FreeNAS and have built a trunk in my HP 1810-24G switch for those two ports. I disabled the trunk temporary and used only a single gigabit connection, but the result is the same.

I first thought it might be a samba misconfiguration, but when running iperf.exe (2.0.5-3) on Windows it told me the bandwidth is between 320 Mbits/sec and 334 Mbits/sec.

Any ideas why I have that slow speeds? I still have a Synology NAS, which I can copy with 115MB/seconds to...

Regards,
AMiGAmann

 

[SweetAndLow]

Tell us about your client. How is it connected to the network, what type of nic does it have. Can you run I perf both directions and to different hosts on the network. I suspect a bad cable or switch port.

 

[AMiGAmann]

Well now I'm really confused. One client has an Intel chipset with an integrated Intel NIC, which I currently updated to the latest driver. Another client has an Intel chipset with a Realtek NIC, which I also updated to the latest driver.

I did several iperf tests from (Windows) clients to FreeNAS server, these are the confusing results:

clt01 to srv
448-466 Mbits/sec, 56-58 MB/s

srv to clt01
572-586 Mbits/sec, 71-73 MB/s

clt02 to srv
540-564 Mbits/sec, 67-70 MB/s

srv to clt02
702-712 Mbits/sec, 87-89 MB/s

clt01 to clt02
624-663 Mbits/sec, 78-82 MB/s

clt02 to clt01
426-444 Mbits/sec 53-55 MB/s

I don't unterstand why the speed varies between different directions, e.g. clt01 to srv is 466 Mbits/sec, while srv to clt01 is 586 Mbits/sec.

Overall the network speed seems to be very low. I tested a direct connection between clt01 and clt02 (while still using the CAT 6A cables inside the house), which did not improve the iperf result.

But I am still able to copy a big file from clt01 to a Synology NAS connected to the switch (also using the inhouse cabling) with 95-105MB/seconds.

Very confusing...

 

[AMiGAmann]

Today I connected a laptop directly to one of the clients and started iperf, which estimated 456Mbits/sec.

I thought this should lead in >800Mbits/sec?

 

[nightshade00013]

I am going to make a guess here that the clients that are having slower transfers are using spinning disks, the slowest link in the system will be the single spinning disk.

The network connection nor the FreeNAS are not the slowest part of the systems the Hard Drives are. If you want to have faster transfer speeds of files the clients will need some type of raid or an SSD.