KB2754704 – DSM Notifies MPIO On W2008 And W2008 R2 That A Path Is Back Online

Not a Hyper-V fix per se, but it is one that a number of you will care about.  The article by Microsoft describes a hotfix that provides a mechanism for Microsoft Device Specific Module (DSM) to notify Microsoft Multipath I/O (MPIO) that a particular path is back online. This hotfix adds a new notification type to the existing DsmNotification interface.