The nice moon is out again tonight / Articles

There are some nice information coming from the Windows BUILD conference. While the videos and presentations are not yet published at http://channel9.msdn.com/events/BUILD/BUILD2011 some blogger are posting as much info as possible:) At the moment, the best what you can get is http://www.aidanfinn.com/ and http://www.hyper-v.nu/.

I have find some features that aren't mentioned yet:

• Second Level Paging (Hypervisor swapping)

I've got no idea how it's implemented, but one should remember the following blog posts:

"With Second Level Paging, memory assigned to a virtual machine can be backed by memory or by disk. The result is that Second Level Paging creates issues that are unique to a virtualized environment. When the system is oversubscribed, the virtualization layer can and will blindly and randomly swap out memory that the guest is holding even critical sections that the guest kernel is specifically holding in memory for performance reasons." [Jeff Woolsey, http://blogs.technet.com/b/virtualization/archive/2010/05/20/dynamic-memory-coming-to-hyper-v-part-5.aspx]

I would say, they have implemented second level paging that is OS aware - using integration services and for guests that are not hypervisor aware, they don't care. Or VMware was right http://blogs.vmware.com/virtualreality/2011/02/hypervisor-memory-management-done-right.html?:)

• Online snapshot merging

One of the new yet unmentioned features is online snapshot merging. Now you can create snapshots, delete them and merging is on-the-fly with no need to shutdown the VM. It works with VHD and VHDX.

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