We currently have 2 physical site connected by a 50MB WAN link. It is presented as a 100Mb/s ethernet bridge, that is throttled to 50Mb/s by the Telecom providor. There is 65ms latency on the line. Using IPERF we have determiend that a 2MB window size on TCP gives us optimal performance on the WAN link and with a packetshaper we can push data at a sustained 45Mb/s both ways over this line. I am used HP's MirrorStore for Virtual Infastructure (which is an OEM of DoublerTake for VI) to replicate VMs from one site to the other site. This software, with out any changes to the ESX host buffer/windows setting, only performs at 7Mb/s sustained.
Does anyone have any recommendations on what to change on the ESX host to allow the ESX Managment interface to increase it's buffer/windows setting to beter utilize a 50Mb/s with 65ms latecy WAN link?
The replication software essentially does an SCP copy from one ESX host to the other ESX host. so don't worry too much about the replication software and it's settings, don't let that get confusing. If you have any history on SCP copies over a WAN link and tuning the TCP/IP window/buffer setting, I would greatly appriciate it.
Thanks, Ernest