The host should be powered on to help provide more capacity for the cluster or help hosts that are overloaded.
The recommendation might be made because:
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The cluster is a DRS-HA cluster. Additional powered-on hosts are needed in order to provide more failover capability.
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Some hosts are overloaded and virtual machines on currently powered-on hosts can be moved to hosts in standby mode to balance the load.
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The capacity is needed to meet the MinPoweredOn{Cpu|Memory}Capacity advanced options.
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