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.
W ndows Server 2008 Enterpr se Ed t on x64
Network Adapter 0
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>
4 GB RAM
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