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Dynamic Memory–Not Your Father’s Memory Overcommit : 20+ Days of Server Virtualization (Part 3 of 20)

clip_image002[6]Part 3 of our “20+ Days of Server Virtualization” series is about Dynamic Memory in Hyper-V.  As the title suggests, this is not your Father’s Memory Overcommit.

“Memory Overcommit?  Isn’t that a VMware capability?”

In the context of virtualization, yes.  (It may be something addressed in the field of Neuroscience, but I’m no rocket scientist…)

Before we talk about it, let’s take a look at the word “Overcommit” (from The Free Dictionary):

O·ver·com·mit (vr-k-mt)
v. o·ver·com·mit·ted, o·ver·com·mit·ting, o·ver·com·mits
v.tr.

  1. To bind or obligate (oneself, for example) beyond the capacity for realization.
  2. To allocate or apportion (money, goods, or resources) in amounts incapable of replacement.

v.intr.

  1. To be or become overcommitted.

That phrase “beyond the capacity for realization” is important.  To overcommit memory means to obligate more memory be used than the capacity we actually physically have. 

“Is that a good thing?”

It can be, if, in the case of the consolidation ratios of virtual machines on a physical host, it’s more important for you to pack more onto a box than it is to get decent performance out of those virtual machines.

“Dynamic Memory” is Microsoft’s solution (in Hyper-V) to do something similar.   But in this case, Microsoft does not overcommit.  By contrast, it allocates memory to or from VMs sharing a virtualization host based on the memory demand of the VMs. 

Today in Part 3, my friend Dan Stolts expands on this definition and these technologies for us.

READ HIS EXCELLENT ARTICLE HERE

---

Do you have Dynamic Memory?  Do I?  I can’t recall. 

But I do remember that you can evaluate Windows Server 2012 for free, and try out Hyper-V Dynamic Memory.  And Microsoft Hyper-V Server 2012 also supports Dynamic Memory, and is a FREE virtualization platform.

So at least that’s something.

Read the original blog entry...

More Stories By Kevin Remde

Kevin is an engaging and highly sought-after speaker and webcaster who has landed several times on Microsoft's top 10 webcast list, and has delivered many top-scoring TechNet events and webcasts. In his past outside of Microsoft, Kevin has held positions such as software engineer, information systems professional, and information systems manager. He loves sharing helpful new solutions and technologies with his IT professional peers.

A prolific blogger, Kevin shares his thoughts, ideas and tips on his “Full of I.T.” blog (http://aka.ms/FullOfIT). He also contributes to and moderates the TechNet Forum IT Manager discussion (http://aka.ms/ITManager), and presents live TechNet Events throughout the central U.S. (http://www.technetevents.com). When he's not busy learning or blogging about new technologies, Kevin enjoys digital photography and videography, and sings in a band. (Q: Midlife crisis? A: More cowbell!) He continues to challenge his TechNet Event audiences to sing Karaoke with him.

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