This feature is new in Windows Server 2012 R2. Storage QoS ensures that the storage throughput of one virtual hard disk does not impact the performance of another virtual hard disk on the same host. Storage QoS enables you to specify the maximum and minimum I/O loads in terms of I/O operations per second (IOPS) for each virtual disk in your virtual machines.

Storage QoS enables you to manage storage throughput for virtual hard disks that are accessed by your virtual machines. Hyper-V in Windows Server 2012 R2 includes storage Quality of Service (QoS). The virtual hard disk size can be increased or decreased through the user interface while virtual hard disk is in use.įor more information, see Online Virtual Hard Disk Resizing Overview. Online virtual hard disk resizing is only available for VHDX files that are attached to a SCSI controller. Resizing virtual hard disks while the virtual machine is running enables an administrator to perform configuration and maintenance operations on the virtual hard disks while the associated virtual machine is online or the virtual hard disk data disk is in use. Hyper-V storage has been updated to support resizing virtual hard disks while the virtual machine is running. It was not possible to cluster virtual machines by using a shared virtual hard disk in previous releases of Windows Server.įor more information, see Virtual Hard Disk Sharing Overview, Resize virtual hard disk The shared virtual hard disk files can be hosted on Cluster Shared Volumes (CSV) or on Server Message Block (SMB)-based Scale-Out File Server file shares. Shared virtual hard disks enable multiple virtual machines to access the same virtual hard disk (VHDX) file, which provides shared storage for use by Windows Failover Clustering. This feature is used to build a high availability infrastructure, and it is especially important for private cloud deployments and cloud-hosted environments that manage large workloads. Hyper-V in Windows Server 2012 R2 enables clustering virtual machines by using shared virtual hard disk (VHDX) files.

The following table lists functionality in Hyper-V that is new for this release or has been changed. For more information about Hyper-V, see the Hyper-V overview. Hyper-V virtualizes hardware to provide an environment in which you can run multiple operating systems at the same time on one physical computer, by running each operating system on its own virtual machine. The Hyper-V role enables you to create and manage a virtualized computing environment by using virtualization technology that is built in to Windows Server 2012 R2. For information about Hyper-V on Windows Server® 2016 Technical Preview, see What's new in Hyper-V on Windows Server 2016 Technical Preview. This topic explains the new and changed functionality of the Hyper-V role on Windows Server 2012 R2.

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