In Pictures: 10 great new features in Windows Serv...
Windows Server 2012 R2 includes the ability to limit individual VMs to a specific level of I/O throughput. In the screenshot at left, you can see the two settings for minimum and maximum IOPS. In the initial release of Windows Server 2012 R2, the only number that really makes a difference is the maximum limit. The IOPS are measured by monitoring the actual disk rate to and from the attached virtual hard drives. If you have applications capable of consuming large amounts of I/O, you'll want to consider this setting to ensure that a single I/O-hungry VM won't starve neighbor VMs or take down the entire host
In Pictures: 10 great new features in Windows Server 2012 R2 Hyper-V