Failover Clustering
The initial release of Microsoft Hyper-V Server 2008 did not include support for failover clustering. However, with Microsoft Hyper-V Server 2008 R2, host clustering technology is included to enable support for unplanned downtime. It's advisable to use the new Cluster Shared Volumes (CSV) feature of Failover Clustering in Windows Server 2008 R2 with live migration. CSV provides increased reliability when used with live migration and virtual machines, and also provides a single, consistent file namespace so that all servers running Windows Server 2008 R2 see the same storage. In addition, failover clustering requires shared storage for the cluster nodes. This can include an iSCSI or Fiber-Channel Storage Area Network (SAN).
Live Migration
Microsoft Hyper-V Server 2008 R2 includes support for live migration. Live migration enables customers to move running applications between servers without service interruptions. Live migration requires the failover clustering role to be added and configured on the servers running Hyper-V.
Live migration does the following to facilitate greater flexibility and value:
Provides better agility. Datacenters with multiple servers running Hyper-V can move running virtual machines to the best physical computer for performance, scaling, or optimal consolidation without affecting users.
Reduces costs. Datacenters with multiple servers running Hyper-V can service their servers without causing virtual machine downtime or the need to schedule a maintenance window. Datacenters will also be able to reduce power consumption by dynamically increasing consolidation ratios and turning off unused servers during times of lower demand.
Increases productivity. It is possible to keep virtual machines online, even during maintenance, which increases productivity for both users and server administrators.
Processor and memory support
Microsoft Hyper-V Server 2008 R2 now supports up to 8-socket physical systems and provides support for up to 32-cores. In addition, Microsoft Hyper-V Server 2008 R2 supports up to 1TB of RAM on a physical system.
Updated Hyper-V Configuration Utility
The Hyper-V Configuration utility is designed to simplify the most common initial configuration tasks. It helps you configure the initial configuration settings without having to type long command-line strings. New configuration options have been added for R2 including:
Remote Management Configuration
Failover Clustering Configuration
Additional options for Updates
Virtualization Platform Comparison
The following is an overview comparison of the feature and support set for:
Microsoft Hyper-V Server 2008
Microsoft Hyper-V Server 2008 R2
Windows Server 2008 R2 (Enterprise and Datacenter Editions)
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