Mpio.sys – Pre Service Pack 3 Revision History for Windows Server 2008 SP2 and Windows Small Business Server 2008 (SBS2008)

09-Oct-2012 – 6.0.6002.22946 – Mpio.sys – x86/x64 – https://support.microsoft.com/kb/2754704 – A hotfix is available that provides a mechanism for DSM to notify MPIO that a particular path is back to online in Windows Server 2008

06-May-2011 – 6.0.6002.22637 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/2522766 – The MPIO driver fails over all paths incorrectly when a transient single failure occurs in Windows Server 2008 or in Windows Server 2008 R2

12-Mar-2011 – 6.0.6002.22610 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/2406705 – Some I/O requests to a storage device fail on a fault-tolerant system that is running Windows Server 2008 or Windows Server 2008 R2 when you perform a surprise removal of one path to the storage device

05-Mar-2010 – 6.0.6002.22355 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/979743 – You cannot use an MPIO storage device after a failover operation in Windows Server 2008 or in Windows Server 2008 R2

11-Jun-2009 – 6.0.6002.22151 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/970525 – Cluster resources fail over before the time expires in the PDORemovePeriod parameter in Windows Server 2008

29-Apr-2009 – 6.0.6002.22125 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/968287 – The MPIO failover process does not complete on a Windows Server 2008-based computer that uses Microsoft Device Specific Module for MPIO