Hello people of the internets,

 

I'm trying to fix a "slow" file transfer issue between my PC and my Unraid server. I have installed 10 GBps NICs in my computer and server (HP NC552SFP in Unraid, Intel X520-DA2 in PC), but I can  barely reach 300 MB/s when writing to the Unraid server and between 200 and 400 when reading from the server. Isn't the server supposed to write to RAM then cache to make it fast ? The PC has a WD Black NVME SSD, and the server is a R520 with dual Xeon 2430L, 32 GB ECC 1333mhz, HP 500GB SATA SSD connected to the PERC H710p Mini (converted to IT mode / LSI 2308-2 controller).

 

I did run Iperf3 tests between the PC and the server, and I'm getting ±9.2/9.4 Gbps of throughput so the network doesn't seem to be the issue. This was tested using the following command : iperf3 -c <machine> -P 5 -t 10 -b 10G

 

From Unraid to Windows

[SUM]   0.00-10.00  sec  10.7 GBytes  9.22 Gbits/sec    0             sender
[SUM]   0.00-10.00  sec  10.7 GBytes  9.21 Gbits/sec                  receiver

 

From Windows to Unraid

[SUM]   0.00-10.00  sec  11.0 GBytes  9.42 Gbits/sec                  sender
[SUM]   0.00-10.04  sec  11.0 GBytes  9.38 Gbits/sec                  receiver

 

I am taker for any advice/suggestion !

Try using a disk share instead to test, user shares will always have some overhead, some systems it's a small difference, but it can also be huge.

On 12/27/2021 at 9:29 AM, JorgeB said:

Try using a disk share instead to test, user shares will always have some overhead, some systems it's a small difference, but it can also be huge.

Thanks for the suggestion.

 

I just did, and it more than doubled the speed.

 

This is to a user share

 

This is to a disk share:

 

Why is it so different? What can I do to improve user share writes/read?

 

I've tried enabling Direct I/O but it didn't help, still around 300 MB/s for the same operation to a user share

Edited January 17, 20224 yr by vizi0n

That's a known issue, user shares always add some overhead, but some users/configs are much more affected than others, direct i/o shouldn't make any difference with recent releases, IMHO best option is still to use disk shares whenever possible.

Interesting. Is there a bug that I can follow to keep updated on this ? I was under the impression that file transfers were using RAM first to speed things up. Seems like I was wrong

There a discussion about that in many topics, e.g.:

 

https://forums.unraid.net/bug-reports/stable-releases/slow-smb-performance-r566/?do=findComment&comment=8514