Home > Storage > PowerStore > Virtualization and Cloud > Dell PowerStore: VMware vSphere Best Practices > Virtual machine affinity with Model X appliances
When using PowerStore Model X appliances in a multi-appliance cluster, remember that while the cluster may have multiple ESXi hosts, each virtual machine’s virtual disks are bound to an individual appliance. This means that virtual machine storage performance may experience higher latency if the virtual machine is vMotioned to other appliances in the cluster. The best practice is to always keep the virtual machine running in the two hosts of the appliance that own the volumes. If the virtual machine must be relocated to another appliance in the cluster, you can nondisruptively move the virtual disks using the migration wizard in the PowerStore user interface. To prevent the VMware Distributed Resource Scheduler (DRS) from automatically migrating a virtual machine to non-optimal nodes in the cluster, assign the integrated VM/Host Rules in vCenter to any virtual machine. See the following figure.