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Configure guests to utilize only the resources needed to achieve the desired performance and maximum consolidation ratio.

The diagram below illustrates a guest virtual machine configured with a moderate amount of resources such as 4 logical processors, 4 GB of RAM, multiple SCSI controllers, and multiple network adapters running Windows Server 2008. In this example, the guest includes an IDE boot disk (VHD) and four SCSI pass-through disks. Guest storage architecture is detailed in the next section.

Hyper-V Guest

W ndows Server 2008 Enterpr se Ed t on x64

Network Adapter 0


vSwitch 1


Network Adapter 1


vSwitch 2 VLAN:

Disk 1 Pass Through LUN 2

Disk 1 Pass Through LUN 4

SCSI Controller 0

SCSI Controller 1

Disk 0 Pass Through LUN 1

Disk 0 Pass Through LUN 3

IDE Controller 0 Boot Disk (VHD)

IDE Controller 0 <available>

IDE Controller 1 DVD Drive

IDE Controller 1 <available>


Log ca Processor 1 Log ca Processor 3

Log ca Processor 2 Log ca Processor 4

Virtual Machine Storage

Volumes and Partitions Guests running on Windows Server 2008 R2 and Hyper-V host servers benefit

from many of the same disk I/O performance tuning techniques as servers running Microsoft® SQL Server® or Microsoft® Exchange Server. Dedicating a high speed LUN to the operating system and placing virtual hard disk files (.VHDs) and virtual machine configuration files on separate high speed LUNs are

recommended. Segregating disk I/O onto separate physical spindles may still be appropriate depending on the workload‘s performance characteristics. Please reference the application-specific guidance for disk I/O segregation recommendations.

Hyper-V also provides the option to use pass-through disks that provide the guest with direct access to a LUN without the disk being presented to the host. This feature may be a good fit when considering reallocating storage. For example, when VM data reaches a certain size it makes more sense to re-map the LUN rather than copy the data. At that point, consider pass-through disks.

If you are using a storage array, confirm with your storage vendor the appropriate track and sector values for your storage system and use the Diskpart.exe tool to verify that your disk tracks are sector-aligned. In most cases with Windows Server 2008 R2, this is not necessary, but it should be verified with

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