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VMware vSphere Essentials by Christian Stankowic, Kunal Kumar

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Distributed Resource Scheduler (DRS)

DRS continuously monitors utilization across ESXi hosts. It smartly allocates available resources among virtual machines, based on business or resource requirements. DRS is a powerful feature which balances the virtual workloads automatically, in order to effectively manage available resources and eliminate resource contention across configured hosts. DRS makes use of vMotion to optimize resource automation for automatic migration of VMs across hosts in a cluster. Using a feature called initial placement DRS ensures that added virtual machines are placed on a particular ESXi host with the lowest resource utilization. As a result, newly created virtual machine don't affect a DRS cluster's fair resource distribution. ...

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