Hello,
If you using VMware infrastructure with vcenter, you can gohead with VMware Fault Tolerance. Refer the below link for FT Design & Configuration.
VMware vSphere 4 - ESX and vCenter Server
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwjflNiMpf...
FAQ: VMware Fault Tolerance (1013428) | VMware KB
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Thanks,
Srini
