When a VM is first created, it is allocated a fixed amount of memory. To improve the utilization of physical memory in your XenServer environment, you can use Dynamic Memory Control (DMC), a memory management feature that enables dynamic reallocation of memory between VMs.
The Memory tab in XenCenter shows memory usage and configuration information for your VMs and servers.
VMs with the same memory configuration are grouped together on the Memory tab, enabling you to view and configure memory settings easily for individual VMs and for groups of VMs.
Dynamic Memory Control is available in Citrix XenServer Advanced Edition or higher. To learn more about the features available in different XenServer Editions, click here.