Only about 30MByte/s on SG500X between vm and Windows Client

Hello,
I just bought 3 SG500X-48 switches and after some starting tests I try to bring them to production. I use esx 5.5 server with 8x1GB Interfaces direct connected to the switch with new cat6 cables and there are 6 virtual machines on it. On the esx I created a vSwitch with teaming on ip hash with all 8 nic's. On the switch I created a lag without lacp.
I have a really flat network, without any vlan yet. I just tried to copy some data on a virtual machine. It seemed to be slow to me, so I started useing jpperf (iperf) to test the data transmission. I was really suprised, that I can get not more that 30 MByte/s on that net.
The virtual machine is a quite new windows 2012 R2 server, with vmware net3 driver 4 proc and 16 gb ram.
The testing client is also direct connected to that switch.
Any suggestion why I can't get more net performance?

Hi Spelzetter, if all of the links are participating in the link aggregation, the one thing I've seen most commonly is actually the software / driver on the Window's NIC needing to be updated. If you're still not getting the desired results you may just need to trial and error the load balance mechanism on the Server until you get the result within 10% of what you want.

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I am pretty sure the issue is a simple GPT/MBR discrepancy.
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From Windows, run Partition Wizard and try "Repair MBR".
From OSX, download recent gptsync and try to run it.
From Windows, use Partition Wizard to do a full MBR --> GPT conversion.
Nuke the Windows partition in OSX Disk Utility, expand the HFS partition to take up the whole drive, and then add a Windows-bootable partition via Boot Camp-ish command line commands (diskutil). Because if nothing else works, I have to assume I just created the partitions wrong in the first place such that a Windows restore miraculously works, but the partition weirdness is just a timebomb waiting to happen.
Finally, if none of the above work, I'll just get things back to the way they now work and wait for the timebomb to (possibly never) go off. *smile*
I'll update this thread if I get something figured out, in case anyone else stumbles upon it...
Thanks,
sutekh138

Only about 30MByte/s on SG500X between vm and Windows Client

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