Microsoft System Center Virtual Machine Manager 2008 R2 Reviewer’s Guide 3
Maintenance Mode
The new Maintenance Mode feature in VMM 2008 R2 allows an administrator to specify that they will
be performing maintenance tasks on a Hyper-V host. For example, if live migration is configured on the
host, then all active virtual machines will be migrated off the host onto other available Hyper-V hosts
during the maintenance period. If live migration is not available, then the state of all virtual machines on
the host is saved.
Rapid Provisioning
The Rapid Provisioning feature new in VMM 2008 R2 allows an administrator to deploy a new virtual
machine without needing to copy virtual hard disk (VHD) files across the network. Instead, the virtual
machine VHD files are copied on the backend, and VMM’s template feature is then used for guest
operating system customization. The template includes the operating system’s answer file that allows
the user to quickly customize the virtual machine on startup. Rapid provisioning is then performed using
PowerShell scripts.
Host Compatibility Checks
One of the requirements for live migration is that all hosts must have compatible processors. In order
for live migration to work, each Hyper-V host must use processors from the same vendor and they must
be in the same processor family. For example, you cannot set up live migration if one host is using an
AMD processor and the other host is using an Intel processor. The new Host Compatibility Check
feature validates that the processors used in each Hyper-V host are compatible for live migration.
VMM Key Benefits
VMM makes data center management more efficient by simplifying several important tasks. IT
administrators can easily consolidate underutilized physical servers, provision new virtual machines,
centrally manage virtual assets, and optimize virtual infrastructure — all while taking advantage of
existing investments and expertise. The following subsections summarize key benefits.
Optimizes Resource Utilization
Many data centers operate at full capacity for space, power, and cooling while the average CPU
utilization of a server in those data centers is between 5 percent and 15 percent. Virtualization helps
increase server utilization rates by allowing IT administrators to consolidate workloads on fewer
physical machines. This consolidation results in lower power, space, and cooling costs.
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