what is VMware Distributed Resource Scheduler

VMware Distributed Resource Scheduler provide automatic distribution of resource utilization across multiple ESX/ESXi hosts that are configured in a cluster

DRS attempts to place each virtual machine on the host that is best suited to run
that virtual machine at that time.(intelligent placement)

three servers have been configured in an ESX/ESXi cluster with DRS enabled.When one of those servers begins to experience a high contention for CPU utilization, DRS uses an internal algorithm to determine which virtual
machine(s) will experience the greatest performance boost by being moved to another server with
less CPU contention.

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