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Chapter 11 DRS Cluster Configuration > Implementation and Management

IMPLEMENTATION AND MANAGEMENT

As mentioned earlier, when considering the creation of a new DRS cluster, you need to evaluate the current utilization of the existing hosts, and determine whether additional servers will be required to efficiently host the VMs.

The deployment of shared storage is a critically important factor that must be considered. VMs that are stored on local storage cannot vMotion, and as a result, will impede DRS from maximizing the functionality of the cluster. This is important not only from a load-balancing aspect, but it is also a major factor in a host entering Maintenance Mode successfully.

Figure 11.5
Competition between VMs.

Images

Also, it is important to verify that each of the VMs is “vMotion compliant,” meaning that it meets all the requirements to successfully vMotion. If a VM is designed with these constraints in mind, clustering is a much easier process. If a VM cannot vMotion for any reason, it impedes DRS from fully functioning. In the case of performing an update on an ESXi server, this means that the server will need to be powered down to complete the update, causing an outage to any VMs that it is hosting.


  

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