To resolve this issue, we have released an update rollup for Windows Server 2012 R2, and we have released an hotfix for Windows Server 2012, Windows 7, or Windows Server 2008 R2. Note This hotfix enables MSDSM to handle the sense code 02/04/03 (LUN Not Ready – Manual Intervention Required).

You configure Microsoft Multipath I/O (MPIO) and Microsoft Device Specific Module (MSDSM) as multiple paths that are configured to the storage array. A path to the storage device fails and the path failover process starts.

The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components.

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 and Windows Server 2008 R2 - Microsoft Support.

Fixes an issue in which a computer that is running Windows Server 2008 crashes, and a Stop error occurs when you use the Microsoft Device Specific Module for MPIO to control a storage device, and Asymmetric Logical Unit Assignment is enabled for this device.

Cause. This issue occurs because the system does not perform a null check before dereferencing the target port of the device. Resolution. Hotfix information. A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article.

Symptoms. Consider the following scenario: You configure a computer that is running Windows Server 2008 R2 Service Pack 1 (SP1) to use Microsoft Multipath I/O (MPIO). You connect a storage device that is configured to use Asymmetric Logical Unit Access (ALUA) to the computer that has multiple active paths. Multiple active paths fail.

This problem occurs when the Windows Server 2008 R2-based system has a storage solution that uses Microsoft Multipath I/O (MPIO) with the Microsoft Device Specific Module (MSDSM) together with Asymmetric Logical Unit Assignment (ALUA). A transient error on the storage subsystem can cause a failure to obtain any data from the SCSI Inquiry page 0x83.

When the MSDSM inquires serial numbers of an MPIO device, the system goes into an infinite loop. Additionally, the infinite loop may result in a Stop error. Resolution. To resolve this issue, install the hotfix that is described in this article. Hotfix information. A supported hotfix is available from Microsoft.

Msdsm.sys. 6.3.9600.17088. 181,080. 03-Apr-2014. 08:12. x64. Windows Server 2012 file information notes. Important Windows 8 hotfixes and Windows Server 2012 hotfixes are included in the same packages. However, only "Windows 8" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems ...