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The virtual machine will become of aware of the new limits without needing a restart. Minimum RAM can be decreased, Maximum RAM can be increased and the Memory buffer can be either increased or decreased. Note: These Dynamic Memory fields can be changed while a virtual machine is running. For more information, see the MSDN article What is the memory buffer when dynamic memory is enabled. If the current RAM allocation is 5GB, only 1GB will be kept free. The Memory buffer is relative to the current RAM allocation.įor example, if the current RAM allocation is 10 GB, a 20% buffer will keep 2GB of ‘instant’ RAM free. This ‘excess’ RAM is available before additional RAM is allocated by the host to the virtual machine. The Memory buffer allows for instant RAM should the virtual machine need it. In other words, the virtual machine will always see the ‘high water mark’ of RAM allocated to it. It is also important to note that the visible amount of RAM to the virtual machine will never drop below the highest amount allocated. Even if the virtual machine wants more, the host will never allocate any more RAM than this amount.įrom the virtual machine’s perspective, the visible amount of RAM will start increasing as the demand grows, but it will never exceed this amount. Maximum RAM is the maximum amount of physical RAM that the host will allocate to the virtual machine, regardless of what the load is. Once the virtual machine notifies the host that its RAM requirement has decreased, it will start reducing the amount of physical RAM that is allocated, but never below this amount.įrom the virtual machine’s perspective, it will still see the Startup RAM amount. Minimum RAMĪs the name implies, Minimum RAM is the minimum amount of physical RAM that the host will reserve for the virtual machine. Regardless of what the actual RAM demand is, the host will reserve this for the virtual machine.įrom the virtual machine’s perspective, the amount of visible RAM will never drop below the Startup RAM amount. This is the amount of physical RAM that will be allocated to the virtual machines at startup. When this is selected you have the option to specify three additional fields. When editing the virtual machine’s hardware configuration, you specify the Startup RAM, and you also have the option of enabling Dynamic Memory. This article will focus on how this dynamic process affects what you see from the both the hypervisor and virtual machine’s perspective. This means that from the virtual machine’s perspective, it will have different amounts of RAM depending on the workload. Microsoft Hyper-V’s approach is to let the virtual machine and hypervisor communicate with each other, so that the RAM can be continually adjusted based on the virtual machine’s requirements.
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The two major hypervisors (VMWare and Hyper-V) have different ways of dynamically allocating more or less physical RAM to the virtual machines running on top of them. Running resource intensive applications on a virtual machine is a great way to ensure they do not consume more compute resource than is necessary, and the same physical machine can be used to run multiple discrete workloads.Ī great example of this is generating reports in TMG Reporter, Sophos Reporter or WebSpy Vantage. The reporting process will increase the virtual machine’s RAM and CPU requirements, but once the reporting workload is complete, the actual requirement drops back down again.