Hypervisor VM failover [closed]

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http://serverfault.com – I'm looking to implement some kind of resiliency to our current servers by utilising a hypervisor feature that I'm pretty sure is available (I just don't know if it's available for free.) The idea is to have two VMs, one taking the changes of the other so that they are pretty much identically synced at all times and then if one VM fails the hypervisor fails over to the backup VM, or if the hypervisor fails a secondary machine's hypervisor takes over (yes I'm considering how this will work with multiple machines.) I'm pretty certain that this is possible with VMWare ESXi but I don't know if o (HowTos)