Updated switch and nas transfer speeds dropped a lot

[Dariusz1989]

Hey

I build my nas last week +/- at that time I had 2x x520-da2 cards, 1 pc , 1 workstation and direct connection via CISCO SYSTEMS SFP-H10GB-ACU10M cable.

At that time when I run CrystalDiskMark, I had about 1gb seq32 read, 240 4k32 reads and around 600 seq read(1000/240,600), the writers were in the range of 500mb for seq ones. I know that ARC was helping and all that but even when I copied file on/off the let's say, 1gb that was taking 1-2 seconds - I was super happy.

Recently I got TpLink T1700G 4sfp+ switch. But upon connecting pc + switch + nas now I'm getting 300/100/300mb read and 350/100/350 write. Which is a bit scary. Not to mention if I copy file the transfer starts at 300mb and drops down to10mb. If I read from nas. Writing is a bit better but still hopeless... I enabled/disabled tunables but I'm out of ideas as to where the issue could be. Maybe the swich has bad configuration or something?

When I was putting the cables I had few..."kinks", I know I should not kink it but well it happen its 10m long cable and well not very good with cables - could kink cause that? The transfer speed from my PC to another PC are low too so maybe its switch/kink ?

Has any1 else experienced that? Or do I have bad switch or something?

Thanks for help.

 

[Stux]

Try using iperf to verify network bandwidth. Ideally with old switch and new switch.

 

[Dariusz1989]

Hey

Sadly I dont have another 10gbsfp+ switch. Before I had direct connection - port to port via x520 cards. Now I added switch. Iperf screenshot:

1st scren 1 stream/ seconds 4 streams.

Looks like I am pushing 10gb transfer but 1 stream is capped at 300-400mb, uhh is this just a bad/low quality switch then?

Its weird when I copy file directly from my PC to another PC so PC>10gbsfp+>switch>1gb rj46>other PC I'm getting 40mb transfer speeds... not even 1gb. Whhh