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## Setting the Windows timeout value 

For Windows hosts, the disk I/O timeout value must be set to 60 seconds. To verify this setting, complete the following steps: 

1. Click Start →  Run . Alternatively, open a Power Shell window. 

2. In the dialog box or Power Shell window, enter regedit  and press Enter. 

3. In the registry editor, locate the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\disk\TimeOutValue  key. 

4. Confirm that the value for the key is 60  (decimal value), and, if not, change the value to 60 (see Figure 5-1). 

<img src='content_image/1008878.jpg'>

## Installing the multipathing software 

Microsoft Multipath Input/Output (MPIO) solutions work with device-specific modules (DSMs) that are written by vendors. However, the MPIO driver package does not, by itself, form a complete solution. This joint solution enables the storage vendors to design device-specific solutions that are tightly integrated with the Windows operating system. MPIO is not included with the Windows operating system. Storage vendors must pack the MPIO drivers with their own DSM. 

IBM Subsystem Device Driver DSM (SDDDSM) is the IBM multipath I/O solution that is based on Microsoft MPIO technology. It is a device-specific module that supports IBM storage devices on Windows hosts. The intent of MPIO is to provide better integration of a multipath storage solution with the operating system. It also supports the use of multipath in the SAN infrastructure during the startup process for SAN Boot hosts. 

To ensure correct multipathing with the Storwize V5000, SDDDSM must be installed on Windows hosts. To install SDDDSM, complete the following steps: 

1. Go to the following SDDDSM download matrix to determine the correct level of SDDDSM to install for Windows 2008 R2 or Windows 2012 R2, and then download the package from this IBM Support web page. 

2. Extract the package to your hard disk drive, and run setup.exe  to install SDDDSM. A command prompt window opens (see Figure 5-2). Confirm the installation by entering Yes . 

<img src='content_image/1008877.jpg'>

