The Numbers: Hyper-V R2 and Dynamically Expanding Storage Performance

The Virtualization team is reporting 87% of native performance when using Dynamically expanding drives.


A number of MVPs were emailing today about best practices for High Availability using Hyper-V and Clustered Shared Volumes. A great topics in and of itself but one that I will bring forward more extensive information in the near future.


A side topic came up. Oliver Sommer, respected MVP from Germany, introduced me to the increased performance of Dynamic Expanding drives in Hyper-V R2. Now this should not be confused with dynamic versus basic drive formats. This is dynamically Expanding Storage versus Fixed storage in Hyper-V.


There was a little uncertainty as to the exact numbers of the performance increase. A little research on my behalf revealed the Virtualization team is reporting 87% of native performance when using Dynamically expanding drives. Source: http://blogs.technet.com/virtualization/archive/2009/07/22/windows-server-2008-r2-hyper-v-server-2008-r2-rtm.aspx


In the end, we still recommend fixed disks for production use with Hyper-V R2 because it pre-allocates disk usage upfront, but if you want to use dynamically expanding virtual hard disks and are willing to take a small performance hit, Hyper-V R2 is a must.


Jeff Loucks
Available Technology
Available Technology

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