ESXi Quick Boot has introduced vSphere 6.7 and it’s really an awesome feature for Vmware admins. This feature helps on restarting the ESXi hypervisor without rebooting underlying physical host . Quick Boot eliminates the time-consuming device initialization and self-testing procedures shortening the time. Quick Boot also supports patching and upgrades of vSphere hosts through vSphere Update Manager.
When you reboot earlier version of ESXi hosts, it 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.
There is a cons that every server do not support and compatible for quick boot option. You need to check compatibility before you enable this feature.
Here is a command you can use to check if your system is compatibility for ESXi Quick boot. Run this command on the ESXi host from putty.
/usr/lib/vmware/loadesx/bin/loadESXCheckCompat.py
If your system is compatible with ESXi Quick Boot, you need to configure this feature on vSphere. You must have to use vSphere Flex based Web Client to enable it, though update or patching can be done through either Flex web client or HTML Client.
Steps to Enable ESXi Quick Boot:
- Login to vCenter using vSphere Web Client(Flex based).
- Go to Home Page. Click on Update Manager.
- Under update manager console, go to Host/Cluster Settings.
- Enable Quick boot is disabled by default. Click on Edit button.
- Mark a Tick on Enable Quick Boot.
- Quick boot has been enabled.
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