On Scattered Radiation Due to X-Rays from Molybdenum and by Allison S.K., Duane W.

By Allison S.K., Duane W.

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Figure 1-12. Multiple differencing disks with one parent disk Why use a differencing disk? Imagine you create a virtual machine with Windows 2012 R2 installed, and it is fully configured and operational. You shut down the virtual machine, and based on this VHD, you create a new differencing disk. Your next step is to create a new virtual machine, based on this differencing disk. When the new VM is started, the configuration is read from the parent disk, but all changes are written to the child disk, leaving the parent disk untouched.

35 Chapter 1 ■ Introduction to Exchange 2013 SP1 Nevertheless, differencing disks are a great solution for lab and test environments because they allow you to quickly create multiple virtual machines for testing purposes. ■■Note As you might now understand, if you lose the child disk you lose data, but since you still have to parent disk, there’s a situation you can return to. If you lose the parent disk, you lose everything. This is important to understand and to realize. Pass-Through Disk A pass-through disk is not really a virtual hard disk because it is not stored as a VHD or VMDK file, as with the previous types of virtual disks, but a pass-through disk can be used by a virtual machine.

Figure 1-15. The RPC Averaged Latency increases dramatically when dynamic memory kicks in Dynamic memory is useful for applications that need a memory boost on a temporary basis, like a web server or a file server. Exchange does not need a memory boost; it needs all its memory all the time. Therefore, the use of dynamic memory on an Exchange 2013 server is not supported in a production environment. The same is true for any solution that manipulates the memory inside virtual machines when running Exchange 2013, such as oversubscription of memory.

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