VMware Cloud Community
mozzie
Enthusiast
Enthusiast

VM <> VM 10Gbps Slow Transfer

Hi

I am experiencing slower than normal windows file transfers between VMs but not sure why.

My setup is as follows...

Datastores: 2 x Samsung 840 SSD in RAID 0

Physical NIC: Intel I210 & I217 1Gbps

MTU set to 9000 on vswitch0

Jumbo frames set to 9000 on Guest NICs (VMXNET3 Auto-Neg 10Gbps)

File copy between two VMs (Win2012 R2 & Win8.1) tops out at 90-110 MB/s.Whilst that isn't bad, I would have expected closer to 500MB/s?

ASSD speed test on the VMFS/SSD is around the 1000MB/s read & 800MB/s write so I know the storage isn't the bottleneck here.

Any help/tips to help improve the network performance between two VMs on the same host would be greatly appreciated.

Cheers

Michael

Reply
0 Kudos
2 Replies
yaoviametepe
Contributor
Contributor

Hello Michael 

I hope you found a solution to that issue. If yes, can you please share it with me? I face the same issue. 

Reply
0 Kudos
connecttoduy
Enthusiast
Enthusiast

Hello

I think you mis-understand about speed copy.

With your system with physical NIC 1Gbs is speed data tranfer same 1000Megabit/second = 125MegaByte/second

And with actually 110Mb/s I think is OK, no problem in here.

If you need improve speed, can you change physical NIC to 10Gbs 

 

Regards,

Duy

Reply
0 Kudos