Microsoft server vdi 2008
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- #Microsoft server vdi 2008 windows 7
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- #Microsoft server vdi 2008 windows
This is key because available memory and free memory are very different. I've said that dynamic memory intelligently allocates additional memory to a VM and I use the phrase available memory, and not free memory. Just like with CPU allocation, VMs with higher memory priority will receive additional memory before VMs with lower priority. The other slider is to set the priority of memory allocation for when there isn't enough physical RAM available to provide the desired amounts to all the VMs. If 20 percent is too little or too much based on the VM's needs, you can change this setting using the slider, but 20 percent is generally a good value for most configurations. To avoid this memory starvation, you set a desired percentage of memory to always be available in the VM (20 percent by default), and when the VM has less than that percentage available, more memory is added to the VM to bring it back to the desired figure (assuming RAM is available in the host).
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The process of adding additional RAM can take a few seconds, and during those few seconds the performance of the VM could be crippled-the guest OS would start to move memory pages to its page file to handle the lack of RAM. You set a buffer because you don't want an OS to totally run out of memory before Hyper-V starts giving it more. The first is a percentage of memory to keep as a buffer. You can also see two sliders in the dialog. Based on my expected workloads, this is a reasonable amount for the VM.įigure 1: Configuring dynamic memory for a VM In my example, I've set the maximum to 2GB.
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I suggest you set more realistic values, both for planning and to protect you from some rogue process in one VM that allocates as much RAM as it can. The default value for the Maximum RAM is 64GB (the maximum supported by a VM in Hyper-V). Startup RAM is the memory allocated to the VM when it is initially turned on and Maximum RAM is the size the memory for the VM can grow to based on the VMs needs and physical memory availability. The more interesting option is the Dynamic selection as you see selected in the figure. Notice that you can still use the old Static configuration, where you assign a VM a set amount of memory that is all allocated when the VM is turned on and can't be increased. With dynamic memory, VMs are allocated additional memory if it's available, and memory can be reallocated from other VMs that need it less.įigure 1 shows the dialog for configuring memory for a Server 2008 R2 SP1 hosted VM. This is different from memory overcommitment, where you start each VM with the maximum amount of memory possible regardless of if or how it's being used and hope you don't run out of resources. Hyper-V intelligently allocates memory to VMs over their initial amounts based on need and on the amount of physical RAM that's available. Hyper-V 2008 R2 SP1 introduced dynamic memory, which allows you to define an initial amount of RAM for a VM and the maximum amount of RAM it can be allocated. With SP1, Microsoft has addressed this deficiency by avoiding memory overcommitment like the plague. Hyper-V, however, had one weakness: It lacked memory overcommitment. Virtualization choices were made based on price, management, and integration with the rest of an organization's infrastructure. Even before SP1, the hypervisors from different vendors had nearly reached parity, with little difference between them in terms of performance and functionality. SP1 for Server 2008 R2 makes some minor updates outside of Hyper-V, but in this article I'll be looking at the Hyper-V changes. SP1 is a game changer for virtualization, particularly Virtual Desktop Infrastructure (VDI).
#Microsoft server vdi 2008 windows
When we look at SP1 for Windows Server 2008 R2, however, it's a different ball game, and to say it adds industry-leading new features is no exaggeration.
#Microsoft server vdi 2008 windows 7
You think of phrases such as "increased reliability" and "performance gains," not "industry-leading new features." These perceptions would be accurate if I were talking about Windows 7 SP1-it has updates to resolve problems and improve performance and some minor feature updates related to third-party federation integration, HDMI audio performance, and XPS document rendering, but nothing to justify an article. When you think service pack, you probably think of minor updates and fixes. See the sidebar to this article for more about virtualization RAM technologies.