Here, UPS #1 is protecting the physical PowerChute machine, and UPS #2 is protecting the 3-node Cluster, and vCenter Sever VM is installed on Host A.

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In PowerChute v5.2, all Cluster Hosts must be part of the same UPS setup and Execute Virtualization Shutdown on Hosts in all UPS Setups must be enabled when vSphere Cluster Services (vCLS) is present. |
UPS #2 goes on battery.
PowerChute issues a command to gracefully turn off UPS #4, if this has been configured.
The UPS Critical event is triggered for the three VMware hosts in the cluster.
PowerChute starts a maintenance mode task on the three VMware hosts, and shuts down the VMs/vApps on the three VMware hosts.
PowerChute shuts down the three VMware hosts.
As the physical machine is not affected, PowerChute continues to run.
Here, separate UPS devices are powering two VMware hosts: the vCenter Server and a storage array. PowerChute is installed on the vCenter Server machine and is monitoring all UPS’s. A shutdown command file has been configured for UPS Setup #1 containing UPS #1.

UPS #4 goes on battery.
PowerChute issues a command to gracefully turn off UPS #4, if this has been configured.
The UPS Critical event is triggered for the two VMware hosts in the cluster.
PowerChute starts a maintenance mode task on the two VMware hosts, and shuts down the VMs/vApps on the two VMware hosts.
PowerChute shuts down the two VMware hosts.
As the physical machine is not affected PowerChute continues to run.
UPS #1 goes on battery.
PowerChute issues command to gracefully turn off UPS #1, if configured.
A UPS critical event is triggered for the two VMware hosts.
PowerChute starts a maintenance mode task on the two VMware hosts, and shuts down the VMs/vApps on the two VMware hosts.
The shutdown command file is executed.
After the shutdown command file duration has elapsed, if all VMs have shut down, the maintenance mode task completes and PowerChute shuts down the two VMware hosts.
PowerChute shuts down the vCenter Server machine.