Because it is common for there to be more than one virtual hard disk hosted by a single physical hard disk, it is possible for one virtual disk to monopolize the input/output capacity of a physical disk, causing the other virtual disks to slow down. To help prevent this, Windows Server 2012 R2 enables you to control the Quality of Service (QoS) for a given virtual hard disk.
QoS management in Hyper-V takes the form of controls that enables you to specify the minimum and maximum input/output operations per second (IOPS) for a disk. To configure storage QoS, open the Settings dialog box for a VM, expand a hard drive component, and select Advanced Features to display the Advanced Features page shown in Figure 3-21.
Configuring Storage Quality of Service (QoS)

FIGURE 3-21 Storage Quality of Service controls in Hyper-V Manager

After selecting the Enable Quality of Service Management check box, you can specify Minimum IOPS values and Maximum IOPS values for the disk in 8 KB increments.

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70-410 Installing and Configuring Windows Server 2012 Prep course includes following practice tests:

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