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During a DRS cluster creation, you can choose to enable VMware Enhanced vMotion Compatibility (EVC). This technology ensures vSphere vMotion compatibility for the different hosts in the cluster by creating the common CPU ID baseline for all the hosts within the cluster. All hosts will present the same CPU features to the VMs, even if their CPUs differ. Note that, however, EVC only works with different CPUs in the same family, for example with different AMD Operon families. Mixing AMD and Intel

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Before enabling EVC for a cluster, make sure that the following requirements are met:EVC only works with different CPUs in the same family, for example with different AMD Operon families. Mixing AMD and Intel processors is not allowed.for Intel CPUs, use the CPUs with Core 2 micro architecture and newer. For AMD CPUs, use first-generation Opteron CPUs and newer.enable hardware virtualization on all hosts.enable AMD No eXecute (NX) or Intel eXecute Disable (XD) technology on all hosts.configure vMotion networking for

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DRS affinity rules are used in DRS clusters to control the placement of virtual machines. Three types of rules exist:affinity rules – DRS will try to keep certain VMs together on the same host. These rules are often used in multi-virtual machine systems to localize the traffic between virtual machines.anti-affinity rules – DRS will try to keep certain VMs are not on the same host. These rules are often used to keep the VMs separated for availability reasons.VM to host

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The VM to host DRS rules can either be preferential or required. A preferential rule is softly enforced and can be violated if necessary, for example to ensure the proper functioning of DRS, HA, or DPM. Consider the following example (image source: VMware):As you can see from the picture above, we’ve created two DRS groups for virtual machines (Group A and Group B) and two DRS groups for ESXi hosts (Blade Chassis A and Blade Chassis B).The goal of this

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The VM to host DRS rules can either be preferential or required. A required rule is stricty enforced and can never be violated, unlike a preferential rule. Required rules are often used to enforce host-based licensing. For example, if the software that is running in your VMs have licensing restrictions, you can use a required rule to run those VMs only on hosts that have the required licenses.Here is an example (image source: VMware):In the picture above you can see

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VMware vSphere Distributed Resource Scheduler (DRS) is a feature that enables your virtual environment to automatically balance itself across your ESX host servers in a cluster in an effort to eliminate resource contention. Here is how you can enable DRS on a cluster using vSphere Web Client:1. Select your cluster from the inventory, go to Manage > Settings > vSphere DRS, and click the Edit button on the right:2. The Edit Cluster Settings window opens. Select vSphere DRS on the

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DRS affinity rules are used in DRS clusters to keep certain VMs together on the same host. You can create them using vSphere Web Client:1. Select your cluster from the inventory, go to Manage > Settings > DRS Rules, and click the Add button:2. The Create DRS Rule window opens. Type the name for the rule and choose the rule type. In this example, we will create a rule that will keep two VMs on the same host. Click Add

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