Private virtual local area network or PVLAN
PVLANs allow Hyper-V administrators to isolate virtual machines from each other (for example, virtual machines cannot contact other virtual machines over the network), while still maintaining external network connectivity for all virtual machines. Hence it increases virtual machine isolation in a multitenant environment, while not degrading access to public network resources.
DHCP guard drops server messages from unauthorized virtual machines that are acting as DHCP servers. DHCP server traffic from other virtual switch ports is automatically dropped. Thus it protects against rogue DHCP servers.
Router guard drops router advertisement and redirection messages from unauthorized virtual machines that are acting as routers. Hence it provides better security and an authorization check for virtual machines.
Hyper-V Extensible Switch
The Hyper-V Extensible Switch is a Layer 2 virtual network switch that provides programmatically managed and extensible capabilities to connect virtual machines to the physical network. The Hyper-V Extensible Switch is an open platform that lets vendors provide extensions written to standard Windows application programming interface (API) frameworks.
Multiple monitoring and filtering extensions can be supported at the entrance and outlet portions of the Hyper-V Extensible Switch. It Provides traffic visibility at different layers and enables statistical traffic data to be gathered.
Non-Uniform Memory Access (NUMA) support inside virtual machines
Provides enhanced performance on large virtual machines by enabling the guest operation system and applications to access local memory faster than remote memory.
Single Root I/O Virtualization (SR-IOV) networking devices
Reduces network latency and host CPU overhead (for processing network traffic); increases network throughput. Windows Server 2012 Hyper-V enables support for SR-IOV-capable network devices and allows the SR-IOV virtual function of a physical network adapter to be assigned directly to a virtual machine.
Hyper-V smart paging
Provides a reliable way to keep virtual machines running when there is not enough physical memory available. If a virtual machine is configured with a lower minimum memory than its startup memory and Hyper-V needs additional memory to restart it, Hyper-V smart paging is used to bridge the gap between minimum and startup memory.
Runtime memory configuration
Provides flexibility to use Dynamic Memory as needed, without affecting other virtual machines. Users can make configuration changes to Dynamic Memory (increase maximum memory or decrease minimum memory) when a virtual machine is running.
Resource Metering in Hyper-V
Resource Metering allows users to track how many CPU, memory, storage, and network resources are consumed by a virtual machine over time. This information is gathered automatically (without the need to constantly collect data from the virtual machine) and persists with the virtual machine through live migration/other mobility operations. Windows Server 2012 Hyper-V can track and report the amount of data transferred per IP address or virtual machine.
Virtual hard disk format
VHDX supports up to 64 TB of storage. It helps to provide protection from corruption due to power failures by logging updates to the VHDX metadata structures. It also helps to prevent performance degradation on large-sector physical disks by optimizing structure alignment. Helps to ensure high quality performance on large-sector disks.
Offloaded data transfer
Windows Server 2012 Hyper-V uses SAN copy offload to copy large amounts of data from one location to another. Allows the CPU to concentrate on the processing needs of an application. Provides rapid provisioning and migration of virtual machines.
Data Center Bridging (DCB)
Windows Server 2012 Hyper-V uses DCB capable hardware to converge multiple types of network traffic onto a single network adapter, with a maximum level of service to each. Helps to reduce the cost and complexity of maintaining separate traffic for network, management, live migration, and storage. Makes it easy to change allocations to different traffic flows.
Virtual Fibre Channel in Hyper-V
Virtual Fibre Channel in Hyper-V provides Fibre Channel ports within the guest operating system.
Multipath I/O (MPIO) functionality
Windows Server 2012 Hyper-V uses MPIO functionality for proper connectivity to Fibre Channel storage within a virtual machine.
Support for 4 KB disk sectors in Hyper-V virtual hard disks
This reduces the impact of 512e disks on the virtual hard disk stack. Uses emerging innovation in storage hardware to increase capacity and reliability.
Quality of Service (QoS)
Windows Server 2012 Hyper-V uses minimum bandwidth to assign specific bandwidth for each type of traffic and to ensure fair sharing during congestion. Enables hosting providers and enterprises to deliver services with predictable network performance to virtual machines on servers running Hyper-V. Reduces the need for expensive network adapters.
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