In typical Microsoft fashion they are changing their stance on a very popular feature that Hyper-V could not support yet. Dynamic memory or memory over commit will be coming soon to Hyper-V. You can read the MS release here. It talks about the requests from clients to be able to achieve higher density of VM’s on servers.
- Use physical memory as efficiently and dynamically as possible without impacting performance. Customers investing in virtualization hosts are purchasing systems with larger memory configurations (32 GB, 64 GB, 128 GB and more) and want to fully utilize this system asset. At the same time, they’re purchasing this memory to provide superior performance and to avoid paging.
- Provide consistent performance and scalability. One frequent comment from virtualization users is that they don’t want a feature with a performance cliff or inconsistent, variable performance. That’s makes it more difficult to manage and increases TCO.