Technical data

VSPEX Configuration Guidelines
VMware Horizon View 5.3 and VMware vSphere for up to 2,000 Virtual
Desktops Enabled by Brocade Network Fabrics, EMC VNX, and EMC Next-
Generation Backup
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Virtual machine memory concepts
Figure 51 shows the memory settings parameters in the virtual machine,
including:
 Configured memory—Physical memory allocated to the virtual
machine at the time of creation
 Reserved memory—Memory that is guaranteed to the virtual
machine
 Touched memory—Memory that is active or in use by the virtual
machine
 Swappable—Memory that can be de-allocated from the virtual
machine if the host is under memory pressure from other virtual
machines using ballooning, compression, or swapping
Figure 51. Virtual machine memory settings
We recommend that you follow these best practices:
 Do not disable the default memory reclamation techniques.
These lightweight processes enable flexibility with minimal impact
to workloads.
 Intelligently size memory allocation for virtual machines. Over-
allocation wastes resources, while under-allocation causes
performance impacts that can affect other virtual machines
sharing resources. Over-committing can lead to resource
exhaustion if the hypervisor cannot procure memory resources. In
severe cases when hypervisor swapping is encountered, virtual
machine performance will likely be adversely affected. Having
performance baselines of your virtual machine workloads assists
in this process.