Setting the Windows timeout value Installing the multipathing software For Windows hosts, the disk I/O timeout value must be set to 60 seconds. To verify this  setting, complete the following steps: 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 . 4. Confirm that the value for the key is  60  (decimal value), and, if not, change the value to  60 (see Figure 5-1). 3. In the registry editor, locate the  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\disk\TimeOutValue  key. 1. Click  Start  Run . Alternatively, open a Power Shell window. 2. In the dialog box or Power Shell window, enter  regedit  and press Enter. Figure 5-1 Windows timeout value Figure 5-2 SDDDSM setup Chapter 5. Host configuration  221