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Quick Boot is a vSphere feature that speeds up the upgrade process of an ESXi server. A regular reboot involves a full power cycle that requires firmware and device initialization. Quick Boot optimizes the reboot path to avoid this, saving considerable time from the upgrade process.
Quick Boot of an ESXi host is a setting that allows VMWare Update Manager (VUM) to optimize the remediation time of hosts that undergo patch and upgrade operations. If the Quick Boot feature is enabled, Update Manager skips the hardware reboot (the BIOS or UEFI firmware reboot).
As a result, the time spent by ESXi host in Maintenance Mode shortens and the risk of failures during remediation is minimized.
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