Server Failover / Replication Across WAN

I would like to move two virtual servers from SiteA and put in SiteB to address performance issues
I need help finding solutions for failing over those two servers back to SiteA in the event that SiteB goes down?  

My concern is if SiteB is running those two servers and the internet goes down, would SiteA consider that an HA or FT event and spin up those servers?  Meanwhile SiteB users are still making changes locally to those servers.  What would happen when the internet comes back online?
We are currently running Citrix Xenserver, however we are due for a refresh which will most likely include vmware.  I’ve looked into vmware’s stretched clustering which has very high requirements of 622Mbps.  We are running 100/100Mbps Fiber at SiteA and 200/200Mbps Fiber at SiteB

Initially my thought was to setup SQL clustering on Server1 and setup DFRS w/ namespace on Server2.  I wasn’t too comfortable with DFSR as I have had issues with large files being stuck in the staging folder and never completing replication.  So I started looking outside of OS replication and to VM or Server replication.

Current environment layout:
SiteA – Hosting all server; remote offices are connected via site to site VPN
SiteB – Main office which has a physical domain controller and access all other servers over the VPN
Server1 – SQL server
Server2 – File server which SQL server references

Any help would be much appreciated.  We are looking to automate process.
NENS24Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Have you looked at any of the Replication or HA software by Vision Solutions - http://www.visionsolutions.com/

Especially Double Take - HA.
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Which are the versions of the products you are using (VMware, Windows, SQL Server)?
And which storage solution are you using?
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NENS24Author Commented:
The product would be VMware for the hypervisor and the Windows servers running as guests would be Server 2008 R2 and SQL 2008.  Storage is currently on a Windows SAN but will be moving to a Fujitsu SAN.
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NENS24Author Commented:
I briefly reviewed the visionsolutions double take availability software which may work.  I will be setting up a demo to see if that will work for my situation.

Additionally, i spoke with vmware support.  They proposed SRM.  I explained my concerns with using SRM as how would it truly know if there was a DR event?  I understand it uses a heartbeat but how would it differentiate an internet outage versus a power outage?  If SiteB had an internet outage, SiteB would still be able to function on those two internal servers, however SiteA would think it was down and initiate a DR event, correct?  This would mean the Server1 and Server2 would be running at both SiteA and SiteB.  I'm sure there's something i'm missing.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
SRM to be honest is a bit overkill, and more expensive, than Double Take HA.
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NENS24Author Commented:
Thank you for your response Andrew.  We have been working with the application vendor for months to try and find an answer to the ongoing performance problems.  While we haven't gone with your proposed solution i appreciate your response which has helped to see other options outside of vmware's replication
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