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2 Replies Last post: Nov 7, 2009 3:31 PM by athlon_crazy  

Network performance between two VM's on same ESXi host posted: Nov 6, 2009 8:21 AM

Click to view pacmantravis's profile Novice 19 posts since
Aug 27, 2009

We currently have 8 Vm's running on an ESXi host and we cannot get the network/file transfer speed to break 200Mb/s (Mb not MB)

The esxi host has GigE ports and is connected to the SAN via iSCSI.

Im used to seeing anywhere from 300-500Mb/s on a physical-to-physical transfer and thought it would be the same, if not faster with two VM's on the same host.

What is the limiting factor in this case?

Click to view athlon_crazy's profile Expert 524 posts since
Oct 28, 2007

Could be because of :


  • iscsi - ip storage based tcp/ip translation overhead
  • disk I/O - SATA + iscsi combination may contribute into this (based on my actual experience)
  • network latency - but you should get better if the VM in the same vSwitch, port group or VLAN


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