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the mechanism and behavior of fault tolerance?

Does anyone know FT function?

I got some doubts when trying to implement this to datacenter:

1. does the secondary VM take over the role only when the primary VM's "VM hardware level"/"ESXi host level"  malfunction? 

I'm wondering whether a human error in the guest OS would activate the secondary VM or not...(e.g. administrator accidentally destroyed guest OS network or filesystem)

2. is it allow to run FT across two clusters? (primary and 2nd VM run on different cluster)

the doc didn't say it's not supported but it seemed that the primary and 2nd VM should run in the same storage.

3. since snapshot is not supported with FT's VM, do the primary VM cloning(manually) and implementing vsphere replication conflict with the FT?

Does anyone know?

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