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VMware ESXi Cookbook by Aravind Sivaraman, Mohammed Raffic Kajamoideen

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Configuring the ESXi host and VM for Fault Tolerance

vSphere Fault Tolerance (FT) is also called as super high availability. vSphere Fault Tolerance provides continuous availability to the virtual machines even during the ESXi host failures by eliminating the downtime to the virtual machine and applications running in it. vSphere High availability (HA) provides high availability to virtual machines in case of ESXi host failures but the downtime to the virtual machines will be the time the virtual machine restarted on the other hosts. In vSphere Fault Tolerance, there will be zero downtime even in case of ESXi host failure. FT-protected virtual machines are continuously available even when the parent ESXi host is down.

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