KB2901896 – WS2012 CSV Cache Causing Poor Performance For Hyper-V VMs

Microsoft has released a hotfix for when CSV block cache causes poor performance of virtual machines on Windows Server 2012 Hyper-V.


Consider the following scenario:

  • You have Hyper-V virtual machines (VM) that are configured on Windows Server 2012 Hyper-V Cluster by using Scale Out File Server as the Storage Solution.
  • The virtual machine .vhdx files are held in Cluster Shared Volume (CSV).
  • CSV Block Cache is enabled on the volume.

In this scenario, virtual machines may experience slow performance.


A supported hotfix is available from Microsoft.

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