KB2674551 – Redirected Mode Enabled Unexpectedly In CSV When Running 3rd-Party Application In W2008R2-Based Cluster

Another Hyper-V related (clustering this time) hotfix was just released by Microsoft.  The situation is when redirected mode is enabled unexpectedly in a Cluster Shared Volume when you are running a third-party application in a Windows Server 2008 R2-based cluster.

“Consider the following scenario:

• You are running a third-party application in a Windows Server 2008 R2-based cluster that has the Cluster Shared Volumes (CSV) feature enabled.
• The third-party application has a mini-filter driver that uses an altitude value to determine the load order of the mini-filter driver.
• The altitude value contains a decimal point.
• You set a Cluster Shared Volume to online mode.

In this scenario, the Cluster Shared Volume is set to redirected mode.  This issue occurs because the cluster service assumes that the altitude value is an integer when the cluster service parses the altitude value”.

A supported hotfix is available from Microsoft.