What goes on behind the scenes when upgrading RHEV-H via the WebUI?

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Issue

I would like to better understand exactly what goes on behind the scenes when instructing an upgrade of hypervisor via the WebUI.
I would like to know what risks are involved, for example, overwriting other FC data domain LUNS.
The message 'Reinstall' makes me think that it will just destroy everything from scratch.

Environment

Red Hat Enterprise Virtualization.
Red Hat Enterprise Virtualization Hypervisor.

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